1. 求高一下期英語主要知識點和語法點，急，謝謝！！！
你好，很高興為你解答：
主要語法涉及到了時態 虛擬 非謂語 和倒裝！
2. 高一英語的知識點及語法
大哥，你這問的也太含糊了。好歹也說下你的教材是什麼出版社的，這樣別人也好給答案。
不過，我個人認為你在網路上問這種總結語法的問題還不如自己買本高一的英語輔導書，那個才比較能幫助你
3. 蘇教版高一英語必修一語法知識點總結
一. 直接引語和間接引語 （一）直接引述別人的原話，叫做直接引語；用自己話轉述別人的話，叫做間接引語。間接引語一般構成賓語從句。直接引語必須放在引號內，間接引語則不用引號。直接引語改為間接引語時，除將引語部分變成賓語從句外，還必須對直接引語中的人稱、時態、指示代詞、時間狀語、地點狀語等進行改變。 1. 時態的變化：直接引語變為間接引語時，通常受轉述動詞said, asked等的影響而使用過去化的時態，即把原來的時態向過去推，也就是一般現在時變為一般過去時，現在進行時變為過去進行時，等等。例如： Tom said to me,「My brother is doing his homework.」 →Tom said to me that his brother was doing his homework. 2. 人稱代詞、指示代詞、時間狀語、地點狀語等等的變化： 根據意義進行相應的變化，例如： She asked Jack,「Where have you been?」 →She asked Jack where he had been. He said,「These books are mine.」 →He said that those books were his. （二）直接引語改為間接引語時，都使用陳述語序，但是因為原句的句式不同，所以變成間接引語時所用的連詞會有所不同。直接引語如果是一般疑問句，用連接詞whether或if；如果是特殊疑問句，則用疑問詞引導間接引語。轉述的動詞一般用asked，可以在其後加上一個間接賓語me, him, her, us等。如： She said,「Is your father at home?」 →She asked me if/whether my father was at home. 「What do you do every Sunday?」My friend asked me. →My friend asked me what I did every Sunday. 直接引語如果是祈使句，改為間接引語時，要將祈使句的動詞原形變為帶to的不定式，並在不定式的前面根據原句的語氣（即請求或命令）加上ask, tell, order等動詞，如果祈使句為否定式，則在不定式前加not。其句型為：ask / tell / order someone (not) to do something. 例如： She said to us,「Please sit down.」 →She asked us to sit down. He said to him,「Go away!」 →He ordered him to go away. He said, 「Don』t make so much noise, boys.」 →He told the boys not to make so much noise. 二. 各種時態的被動語態 被動語態概述 被動語態的概念：它是動詞的一種形式，表示主語與謂語之間的執行或被執行關系。主動語態表示主語是謂語動作的執行者，例如：They saw the little boy crying by the river. 被動語態表示主語是謂語動作的承受者，例如：The little boy was seen crying by the river. 被動語態的構成 被動語態的形式是由「助動詞be+動詞的過去分詞」構成。助動詞be隨著主語的人稱、數、時態等的不同而變化。幾種常見時態的被動語態形式如下： 1. 一般現在時 am/is/are + 過去分詞 例如：Rice is planted in the south of China. 2. 一般過去時 was/were + 過去分詞 例如：These trees were planted the year before last. 3. 一般將來時 will/shall + be + 過去分詞 例如：A sports meeting will be held next week in our school. 4. 現在進行時 am/is/are + being + 過去分詞 例如：Your radio is being repaired now. 5. 過去進行時 was/were + being + 過去分詞 When he got there, the problem was being discussed. 6. 現在完成時 have/has + been + 過去分詞 His work has been finished. Has his work been finished? Yes, it has. / No, it hasn』t. 7. 過去完成時 had + been + 過去分詞 注意： 1．除了be之外的其它系動詞如get, stay等也可以和過去分詞構成被動語態。例如：Their questions haven』t got answered. 2. 含有情態動詞的謂語變成被動語態使用「情態動詞+ be + 過去分詞」結構。例如： More attention should be paid to the old in this country. This work can』t be done until Mr. Black comes. 3. 含有「be going to」, 「be to」等結構的謂語，其被動語態分別用「be going to + be + 過去分詞」和「be to + be + 過去分詞」。例如： The problem is going to be discussed at the next meeting. All these books are to be taken to the library. 4. 被動語態與系表結構的區別：「連系動詞+用作表語的過去分詞」構成的系表結構，與被動語態的形式完全一樣，所以應注意它們的區別。被動語態中的過去分詞是動詞，多強調動作；系表結構中的過去分詞相當於形容詞，多強調狀態。前者通常可用by 引出動作的執行者，而後者則不可以。例如： The map was changed by someone.（被動結構） That custom remained unchanged for many centuries.（系表結構） 系表結構中的過去分詞通常可被very修飾，被動語態中的過去分詞往往要用much修飾。 例如： He was very excited.（系表結構） He was much excited by her words.（被動結構） 5. 主動形式表被動意義。有些動詞的主動形式有被動意味，如 open, read, sell, shut, wash, wear, write等。此時句子的主語一般是物。例如： These books sell well. 這些書很暢銷。 The door won』t shut. 這門關不上。 The clothes wash well. 這些衣服很好洗。
Unit 11. 片語： add up add up to add… to… add to calm… down have got to be concerned about / with walk the dog cheat … of go through go ahead go by set down set up set off set out a series of on purpose by accident/ chance in order to so as to in order that so as that at sk at dawn at midnight at noon face to face no longer not … any longer settle down suffer from recover from get/ be tired of make a list of list pack… up get along/ on with fall in love be grateful to sb. for sth. join in take part in join attend make sb/ sth + 賓語補足語 have something/ anything/ everything /nothing to do with it』s because….. +原因 it』s why…. + 結果 dare + (to) do (實義動詞) do (情態動詞) a year and a half it』s no pleasure+ doing sth happen to do sth have trouble with sb (in) doing sth exactly find it + adj. + to do sth make friends with swap … with it is / was + 序數詞 + that + has done / had done ….unit 2片語： because of come up come up with come in come on come out actually in fact as a matter of fact in reality be based on at present make use of make full/ good use of such as play a part/ role in recognize … as more than one + 謂語用單數 at the end of in the end at an end voyage tour travel journey than ever before even if / though communicate with those + 定語從句 用who 1600』s 1980s in + 物主代詞 + 數字的復數 in his forties the former the latter a number of the number of make sense usage VS use believe it or not there is no such + 名詞 （不加冠詞） the way + in which / that /省略 especially specially straight adj/ advunit 3片語： prefer to do , rather than do would rather do , than do would do , rather than do fare VS fee ever since it』s is / has been + 時間段 + since 從句 graate from/ in be fond of cut across cut up cut down care about care for determine to do sth = be determined to do sth change one』s mind make up one』s mind at an altitude of give in give up give off give out give away keep pace with as usual bend over take the advantage of persuade sb to do sth / into doing sth not to do sth/ out of doing sth advise sb to do sth try to persuade sb to do sth although though grow up insist on put up put down put off put on put away can hardly wait to do sth bend over take the advantage of persuade sb to do sth / into doing sth not to do sth/ out of doing sth advise sb to do sth try to persuade sb to do sth although though grow up insist on put up put down put off put on put away can hardly wait to do sth unit 4片語：right away at once immediately burst into laughter/ tears burst out doing sth as if / though in ruins injure wound hurt destroy damage be trapped in dig out bury oneself in doing sth rise raise arise too… to be away it seems as if + 陳述語氣/ 虛擬語氣 act out be pleased / willing/ glad to do sthhonor in honor of be proud of express my thanks to unit 5片語： of high/ good quality devote to + doing found VS set up in principle in peace out of work in work out of control in control vote for vote against be equal to in trouble turn to turn on / off turn up / down lose heart lose one』s heart escape from / + doing sth come to power / in power be sentenced to in one』s opinion fight for / against blow up dream of/ about imagine doing sth the first time for the first time 語法點1. whether VS if 的用法2. tell sb to do sth ask sb not to do sth 3. be + doing 表將來4. 定語從句： 只用that 的情況 只用who 的情況 只用which的情況 as VS which the same … as / that… such… as as … as 介詞+ which/ whom which 引導一個句子的用法 非限制性定語從句which 引導一個句子的用法 非限制性定語從句 插入語 I think I believe I guess I thought 間隔式定語從句 Is this car the one he bought last year? Is this the car he bought last year? What 的用法5. will be done be about to be done be to be done be going to be done 6. has/ have been done 7. be being done 加always 表示一種厭煩等語氣8. 強調句 it is + 被強調部分 + that 從句 It is not until + 時間 + that 從句 特殊疑問詞 + is it that 從句 9. 倒裝句 部分否定，含有否定詞的 hardly never little only seldom 等， 把情態動詞，be 動詞， 助動詞提到主語 的前面10. as if , insist suggest request command ,從句用虛擬語氣， 用（should） do 。
4. 高一英語主要知識點！！
高中英語的重點就是定語從句（句子做定語）。
高一第一學期的語法內容就版是各種定語從句。權
1.定語從句：
關系代詞（that，which，who，whom，whose）和關系副詞（where，when，why）的定語從句。關系代詞在定語從句中做主語或賓語。關系副詞在從句中做狀語。
2.
主語從句，同位語從句。（句子做主語，句子做同位語）。
3.非謂語動詞：動名詞，動詞不定式，分詞（現在分詞和過去分詞）。
5. 高一英語下語法大全
沒有高一的,但有個很全面的
你下來看看.對六級以下內的人都容很有用
http://www.dongneng.cq.cn/dnsq/index.asp?boardid=39
6. 高一學期的英語語法主要教什麼
主要是
名詞性從句
定語從句
小知識點還有一個
強調句
希望能幫到你
謝謝
7. 高一英語知識點及語法
（一）直接引述別人的原話，叫做直接引語；用自己話轉述別人的話，叫做間接引語。間接引語一般構成賓語從句。直接引語必須放在引號內，間接引語則不用引號。直接引語改為間接引語時，除將引語部分變成賓語從句外，還必須對直接引語中的人稱、時態、指示代詞、時間狀語、地點狀語等進行改變。
1. 時態的變化：直接引語變為間接引語時，通常受轉述動詞said, asked等的影響而使用過去化的時態，即把原來的時態向過去推，也就是一般現在時變為一般過去時，現在進行時變為過去進行時，等等。例如：
Tom said to me,「My brother is doing his homework.」
→Tom said to me that his brother was doing his homework.
2. 人稱代詞、指示代詞、時間狀語、地點狀語等等的變化： 根據意義進行相應的變化，例如：
She asked Jack,「Where have you been?」
→She asked Jack where he had been.
He said,「These books are mine.」
→He said that those books were his.
（二）直接引語改為間接引語時，都使用陳述語序，但是因為原句的句式不同，所以變成間接引語時所用的連詞會有所不同。直接引語如果是一般疑問句，用連接詞whether或if；如果是特殊疑問句，則用疑問詞引導間接引語。轉述的動詞一般用asked，可以在其後加上一個間接賓語me, him, her, us等。如：
She said,「Is your father at home?」
→She asked me if/whether my father was at home.
「What do you do every Sunday?」My friend asked me.
→My friend asked me what I did every Sunday.
直接引語如果是祈使句，改為間接引語時，要將祈使句的動詞原形變為帶to的不定式，並在不定式的前面根據原句的語氣（即請求或命令）加上ask, tell, order等動詞，如果祈使句為否定式，則在不定式前加not。其句型為：ask / tell / order someone (not) to do something. 例如：
She said to us,「Please sit down.」
→She asked us to sit down.
He said to him,「Go away!」
→He ordered him to go away.
He said, 「Don』t make so much noise, boys.」
→He told the boys not to make so much noise.
二. 各種時態的被動語態
被動語態概述
被動語態的概念：它是動詞的一種形式，表示主語與謂語之間的執行或被執行關系。主動語態表示主語是謂語動作的執行者，例如：They saw the little boy crying by the river. 被動語態表示主語是謂語動作的承受者，例如：The little boy was seen crying by the river.
被動語態的構成
被動語態的形式是由「助動詞be+動詞的過去分詞」構成。助動詞be隨著主語的人稱、數、時態等的不同而變化。幾種常見時態的被動語態形式如下：
1. 一般現在時 am/is/are + 過去分詞
例如：Rice is planted in the south of China.
2. 一般過去時 was/were + 過去分詞
例如：These trees were planted the year before last.
3. 一般將來時 will/shall + be + 過去分詞
例如：A sports meeting will be held next week in our school.
4. 現在進行時 am/is/are + being + 過去分詞
例如：Your radio is being repaired now.
5. 過去進行時 was/were + being + 過去分詞
When he got there, the problem was being discussed.
6. 現在完成時 have/has + been + 過去分詞
His work has been finished.
Has his work been finished? Yes, it has. / No, it hasn』t.
7. 過去完成時 had + been + 過去分詞
注意：
1．除了be之外的其它系動詞如get, stay等也可以和過去分詞構成被動語態。例如：Their questions haven』t got answered.
2. 含有情態動詞的謂語變成被動語態使用「情態動詞+ be + 過去分詞」結構。例如：
More attention should be paid to the old in this country.
This work can』t be done until Mr. Black comes.
3. 含有「be going to」, 「be to」等結構的謂語，其被動語態分別用「be going to + be + 過去分詞」和「be to + be + 過去分詞」。例如：
The problem is going to be discussed at the next meeting.
All these books are to be taken to the library.
4. 被動語態與系表結構的區別：「連系動詞+用作表語的過去分詞」構成的系表結構，與被動語態的形式完全一樣，所以應注意它們的區別。被動語態中的過去分詞是動詞，多強調動作；系表結構中的過去分詞相當於形容詞，多強調狀態。前者通常可用by 引出動作的執行者，而後者則不可以。例如：
The map was changed by someone.（被動結構）
That custom remained unchanged for many centuries.（系表結構）
系表結構中的過去分詞通常可被very修飾，被動語態中的過去分詞往往要用much修飾。
例如：
He was very excited.（系表結構）
He was much excited by her words.（被動結構）
5. 主動形式表被動意義。有些動詞的主動形式有被動意味，如 open, read, sell, shut, wash, wear, write等。此時句子的主語一般是物。例如：
These books sell well. 這些書很暢銷。
The door won』t shut. 這門關不上。
The clothes wash well. 這些衣服很好洗。
8. 求高一下學期英語語法
動詞的語氣——虛擬語氣(The Subjunctive Mood)
一、語氣的定義和種類
l、語氣：語氣是動詞的一種形式，它表示說話人對某一行為或事情的看法和態度。
2、語氣的種類：
(1)陳述語氣: 表示動作或狀態是現實的、確定的或符合事實的，用於陳述句、疑問句和某些感嘆句。如：We are not ready. 我們沒准備好。What a fine day it is!多好的天氣啊!
(2)祈使語氣: 表示說話人的建議、請求、邀請、命令等。如: Open the door, please。請打開門。
(3)虛擬語氣: 表示動作或狀態不是客觀存在的事實，而是說話人的主觀願望、假設或推測等。如: If I were you, I should study English. 如果我是你，我就學英語了。May you succeed! 祝您成功！
二、虛擬語氣在條件從句中的用法
條件句有兩類，一類是真實條件句，一類是虛擬條件句。如果假設的情況是有可能發生的，就是真實條件句。在這種真實條件句中的謂語用陳述語氣。如: If it doesn』t rain tomorrow, we will go to the park. 如果明天不下雨，我們就去公園。
如果假設的情況是過去或現在都不存在的，或將來不大可能發生的，則是虛擬條件句。如:
If he had seen you yesterday, he would have asked you about it. 如果他昨天見到你，他會問你這件事的。(事實上他昨天沒見到你，因此也未能問你這件事。)
在含有虛擬條件句的復合句中，主句和從句的謂語都要用虛擬語氣。現將虛擬條件從句和主句的動詞形式列表如下:
與現在事實相反: 從句: 動詞的過去式（be的過去式一般用were）
主句:would/ should/ could/ might + 動詞原形
與過去事實相反 : 從句 :had + 過去分詞
主句 :would/ should/ could/ might + have + 過去分詞
與將來事實相反 : 從句:動詞過去式，should + 動詞原形，
主句 :were to + 動詞原形 would/ should/ could/ might + 動詞原形
注: 主句中的should只用於I、we，但在美國英語中，should常被would代替；從句中的should可用於各種人稱。
l、表示與現在事實相反的假設和結果。如: If my brother were here, everything would be all right. 要是我哥哥在這兒 ，一切都沒問題了。
2、表示與過去事實相反的假設和結果。如: If you had taken my advice，you wouldn't
(couldn』t) have failed in the exam. 如果你按照我的建議去做，你一定不會(不可能)考試不及格。
3、表示與將來事實可能相反的假設和結果。如: If it were Sunday tomorrow, I should
(would，could，might) go to see my grandmother. 如果明天是星期天，我就 (可能)去看望我奶
奶。If it were to snow this evening, they would not go out. 如果今晚下雪，他們將不出去了。
4、有時條件從句中的動作和主句中的動作發生的時間不一致（表示錯綜時間的虛擬語氣），這時動詞的形式要根據它所表示的時間加以調整。例如: If you had listened to the doctor, you would be all right now. 如果你當初聽了醫生的話，身體現在就好了。(從句動作指過去，主句動作指現在)
5、虛擬條件句可以轉換成下列形式:
(l)省略連詞if。在書面語中，如果虛擬條件從句中有were，had 或 should，可以把if省略，把這幾個詞放到主語之前，構成主謂倒裝。例如: Should he come (If he should come), tell him to ring me up. 他要是來了，讓他給我打個電話。Were I you (If I were you), I would not do it. 我要是你，就不做這事。
(2)用介詞短語代替條件狀語從句。有時假設的情況並不用條件從句表示出來，而是通過介詞短語來表示。如: Without air (If there were not air), there would be no living things. 如果沒有空氣的話，就不會有生物了。But for your help (If it hadn』t been for your help) I couldn』t have done it. 要是沒有你的幫助，我就不可能完成這件事。
假設的情況有時可以通過上下文或其他方式表現出來。如: I was busy that day. Otherwise I would have gone there with them. (If I hadn』t been busy that day, I would have gone there with them.) 我那天很忙，否則，我就和他們一起去那兒了。(如果我那天不忙的話，我就……)；I would have finished the work, but I have been ill. (If I hadn』t been ill, I would have finished the work.) 我本來該完成這項工作的，但我生病了。(如果我沒生病的話，我就會完成……)
6、省去條件從句或主句：表示虛擬語氣的主句或從句有時可以省略，但其含義仍可以推知。
(1)省去條件從句。如: You could have washed your clothes yourself. 你本可以自已洗衣服的。省去了"If you had wanted to")(事實是:你自己沒洗衣服，因為你不想洗。)
(2)省去主句(常用以表示願望)。如: If my grandmother were with me! 如果我的祖母與我在一起多好啊!(事實是:祖母已不在世。)；If only she had not left! 如果她沒走就好了!(事實是:她已經走了。)
三、虛擬語氣的其他用法
l、虛擬語氣在主語從句中的用法：在"It is important (strange，natural，necessary)that…"這類句型里，that所引導的主語從句中的謂語動詞常用 「should+動詞原形」結構，表示某事是"重要"、"奇怪"、"自然"、"必要"等意義。如: It is important that every member (should) inform himself of these rules. 重要的是每個成員知道這些規則。
2、虛擬語氣在賓語從句中用法：
(1)在動詞wish後的賓語從句中，表示與現在或過去的事實相反，或對將來的主觀願望，從句通常省略連詞that。1)表示對現在情況的虛擬:從句動詞用過去式或過去進行式(be動詞一般用were)。如: I wish I knew the answer to the question. 我希望知道這個問題的答案。(可惜不知道)；2）表示對過去情況的虛擬:從句動詞常用"had+過去分詞"。如: I wish (wished) I hadn』t spent so much money. 我後悔不該花那麼多錢。(實際上已經花掉)；3)表示對將來的主觀願望:謂語動詞形式為"would+動詞原形"。此時要注意，主句的主語與從句的主語不能相同，因為主句的主語所期望的從句動作能否實現，取決於從句主語的態度或意願(非動物名詞除外)。如: I wish it would stop raining. 但願雨能停止；I wish you would come soon. 但願你立刻來。
(2)在suggest，demand，order，propose，insis
9. 高一下學期英語語法總結
網路文庫有不少.
10. 高一下學期英語語法
動詞的語氣——虛擬語氣(The Subjunctive Mood)
一、語氣的定義和種類
l、語氣：語氣是動詞的一種形式，它表示說話人對某一行為或事情的看法和態度。
2、語氣的種類：
(1)陳述語氣: 表示動作或狀態是現實的、確定的或符合事實的，用於陳述句、疑問句和某些感嘆句。如：We are not ready. 我們沒准備好。What a fine day it is!多好的天氣啊!
(2)祈使語氣: 表示說話人的建議、請求、邀請、命令等。如: Open the door, please。請打開門。
(3)虛擬語氣: 表示動作或狀態不是客觀存在的事實，而是說話人的主觀願望、假設或推測等。如: If I were you, I should study English. 如果我是你，我就學英語了。May you succeed! 祝您成功！
二、虛擬語氣在條件從句中的用法
條件句有兩類，一類是真實條件句，一類是虛擬條件句。如果假設的情況是有可能發生的，就是真實條件句。在這種真實條件句中的謂語用陳述語氣。如: If it doesn』t rain tomorrow, we will go to the park. 如果明天不下雨，我們就去公園。
如果假設的情況是過去或現在都不存在的，或將來不大可能發生的，則是虛擬條件句。如: If he had seen you yesterday, he would have asked you about it. 如果他昨天見到你，他會問你這件事的。(事實上他昨天沒見到你，因此也未能問你這件事。)
在含有虛擬條件句的復合句中，主句和從句的謂語都要用虛擬語氣。現將虛擬條件從句和主句的動詞形式列表如下:
與現在事實相反: 從句: 動詞的過去式（be的過去式一般用were）
主句:would/ should/ could/ might + 動詞原形
與過去事實相反 : 從句 :had + 過去分詞
主句 :would/ should/ could/ might + have + 過去分詞
與將來事實相反 : 從句:動詞過去式，should + 動詞原形，
主句 :were to + 動詞原形 would/ should/ could/ might + 動詞原形
注: 主句中的should只用於I、we，但在美國英語中，should常被would代替；從句中的should可用於各種人稱。
l、表示與現在事實相反的假設和結果。如: If my brother were here, everything would be all right. 要是我哥哥在這兒 ，一切都沒問題了。
2、表示與過去事實相反的假設和結果。如: If you had taken my advice，you wouldn't (couldn』t) have failed in the exam. 如果你按照我的建議去做，你一定不會(不可能)考試不及格。
3、表示與將來事實可能相反的假設和結果。如: If it were Sunday tomorrow, I should (would，could，might) go to see my grandmother. 如果明天是星期天，我就 (可能)去看望我奶 奶。If it were to snow this evening, they would not go out. 如果今晚下雪，他們將不出去了。
4、有時條件從句中的動作和主句中的動作發生的時間不一致（表示錯綜時間的虛擬語氣），這時動詞的形式要根據它所表示的時間加以調整。例如: If you had listened to the doctor, you would be all right now. 如果你當初聽了醫生的話，身體現在就好了。(從句動作指過去，主句動作指現在)
5、虛擬條件句可以轉換成下列形式:
(l)省略連詞if。在書面語中，如果虛擬條件從句中有were，had 或 should，可以把if省略，把這幾個詞放到主語之前，構成主謂倒裝。例如: Should he come (If he should come), tell him to ring me up. 他要是來了，讓他給我打個電話。Were I you (If I were you), I would not do it. 我要是你，就不做這事。
(2)用介詞短語代替條件狀語從句。有時假設的情況並不用條件從句表示出來，而是通過介詞短語來表示。如: Without air (If there were not air), there would be no living things. 如果沒有空氣的話，就不會有生物了。But for your help (If it hadn』t been for your help) I couldn』t have done it. 要是沒有你的幫助，我就不可能完成這件事。
假設的情況有時可以通過上下文或其他方式表現出來。如: I was busy that day. Otherwise I would have gone there with them. (If I hadn』t been busy that day, I would have gone there with them.) 我那天很忙，否則，我就和他們一起去那兒了。(如果我那天不忙的話，我就……)；I would have finished the work, but I have been ill. (If I hadn』t been ill, I would have finished the work.) 我本來該完成這項工作的，但我生病了。(如果我沒生病的話，我就會完成……)
6、省去條件從句或主句：表示虛擬語氣的主句或從句有時可以省略，但其含義仍可以推知。
(1)省去條件從句。如: You could have washed your clothes yourself. 你本可以自已洗衣服的。省去了"If you had wanted to")(事實是:你自己沒洗衣服，因為你不想洗。)
(2)省去主句(常用以表示願望)。如: If my grandmother were with me! 如果我的祖母與我在一起多好啊!(事實是:祖母已不在世。)；If only she had not left! 如果她沒走就好了!(事實是:她已經走了。)
三、虛擬語氣的其他用法
l、虛擬語氣在主語從句中的用法：在"It is important (strange，natural，necessary)that…"這類句型里，that所引導的主語從句中的謂語動詞常用 「should+動詞原形」結構，表示某事是"重要"、"奇怪"、"自然"、"必要"等意義。如: It is important that every member (should) inform himself of these rules. 重要的是每個成員知道這些規則。
2、虛擬語氣在賓語從句中用法：
(1)在動詞wish後的賓語從句中，表示與現在或過去的事實相反，或對將來的主觀願望，從句通常省略連詞that。1)表示對現在情況的虛擬:從句動詞用過去式或過去進行式(be動詞一般用were)。如: I wish I knew the answer to the question. 我希望知道這個問題的答案。(可惜不知道)；2）表示對過去情況的虛擬:從句動詞常用"had+過去分詞"。如: I wish (wished) I hadn』t spent so much money. 我後悔不該花那麼多錢。(實際上已經花掉)；3)表示對將來的主觀願望:謂語動詞形式為"would+動詞原形"。此時要注意，主句的主語與從句的主語不能相同，因為主句的主語所期望的從句動作能否實現，取決於從句主語的態度或意願(非動物名詞除外)。如: I wish it would stop raining. 但願雨能停止；I wish you would come soon. 但願你立刻來。
(2)在suggest，demand，order，propose，insist，command，request，desire等動詞後的賓語從句中，謂語動詞用「should + 動詞原形」，表示建議、要求、命令等。如: I demand that he (should) answer me immediately. 我要求他立刻答復我。
3、虛擬語氣在狀語從句中的用法
(1)在帶有even if/ even though引導的讓步狀語從句的主從復合句中，主句和從句都用虛擬語氣，動詞形式與含有非真實條件句的虛擬語氣相同。如: Even if he had been ill, he would have gone to his office. 即使生了病，他都去辦公室。
(2)由as if或as though引導的狀語從句表示比較或方式時。從句謂語形式為動詞的過去式(be用were)或 「had+過去分詞」。如: He treated me as if I were a stranger. 他那樣對待我，好像我是陌
生人似的。She talked about the film as if she had really seen it. 她談論那部影片，就好像她確實看過一樣。
注:如果表示的事情可能會發生，那麼方式狀語從句中的謂語動詞可用陳述語氣。
(3)在in order that或so that引導的目的狀語從句中，謂語動詞多用 「could或might（有時也用should）+ 動詞原形」。如: Mr green spoke slowly so that his students could (might) hear clearly. 格林先生說得很慢，好讓學生聽清楚。
4、虛擬語氣在定語從句中的用法：在"It is time (that) …"句型中，定語從句的謂語動詞常用虛擬語氣表示將來，動詞形式一般用過去式，意思是"該干某事的時候了"。如: It』s (high) time we did our homework. 我們該做作業了。
5、虛擬語氣在簡單句中的用法
(1)情態動詞的過去式用於現在時態時，表示說話人的謙虛、客氣、有禮貌，或委婉的語氣，常見於日常會話中。如: It would be better for you not to stay up too late. 你最好別太晚睡覺。
(2)在一些習慣表達中。如: I would rather not tell you. 我寧願不告訴你。
(3)用「may + 動詞原形」表示"祝願"、"但願」，此時may須置於句首（多用於正式文體中）。如：May you be happy!祝你快樂！May good luck be yours.祝你順利。