▲定義:表示說話人所說的話不是事實,而是一種假設,願望,懷疑或推測。虛擬語氣主要用於名詞性從句，狀語從句和定語從句。
.虛擬語氣在名詞性從句中的用法:
1.賓語從句
⑴ wish+ that -從句 ：
[, , , , , , , , , , , , ]
例如：①i wish that i studied english well.
②i wish (that) you could succeed.
③i wish that i had not said that the other day .
(2)「乙個堅持，兩道命令，四條建議，五項要求」：insist（堅持認為、說；堅持要求）/order（命令）/command（命令）/advise/suggest（建議；暗示，表明）/propose（提議，建議）/recommend（推薦，建議）/ask（要求）/require（要求；需要）/demand（要求；需求）/request（要求；請求）/urge （強烈要求；呼籲）+that –從句：[, , , , , ]
例如：①the man insisted( that ) he had not made mistakes and that he( should) not be punished（懲罰）.
②her pale（蒼白的） face suggested that she was ill and i suggested that she (should) go to see a doctor immediately.
⑶ would rather that -從句: [, , , , , , ]
例如：①i』d rather (that) i had not gone there .
② i would rather that i stayed at home tomorrow.
2．主語從句
⑴ it is suggested/required...that -從句: [, , , , , ]
例如：①it is required that homework (should) be handed in on time .
→對比：(賓從) our teachers require (that ) homework (should) be handed in on time
②it is suggested that we （should） take notes carefully in class.
⑵ it is important/necessary/natural（自然的）/strange/a pity...that -從句:[, , , , , , ]
例如①it is important that we （should） learn english well.
②it is strange that the lazy boy should pass the exam.
注意：此句型表示驚奇、不相信、遺憾、理應如此等。
3．同位語從句
▲suggestion/advice/proposal(提議，建議)/request/order...that -從句: [, , , , , ]
例如：①the professor( 教授) g**e orders that the experiment (should) be finished before
②one of my friends g**e me a piece of advice that i (should) go to school by bike.
4.表語從句
▲suggestion/advice/proposal/request/order... be +that -從句: [, , , , , ]
例如：my advice is that we (should )finish the work as quickly as possible.
．虛擬語氣在狀語從句中的用法:
1.方式狀語從句:
as if/as though + 從句：[, , , , , , , , , , , , , ]
例如：①he walked as if he were drunk.
② the man talked about italy as if he had been there before .
2.讓步狀語從句
even if /even though +從句：[, , ] [ 詳見以下if條件句]
3．條件狀語從句
⑴if引導的非真實條件狀語從句
注意:①錯綜時間條件句：從句與主句的時間不一致，應根據時間來調整動詞的形式。
②if 省略句:were/had/should提到句首。③用介詞短語with/without/but for代替條件狀語從句。
含蓄條件句：為了表達需要用otherwise/or/but/定語從句/獨立主格結構等。
①if i had studied hard , i would work in the office now.
②but for / without your help ,i could not h**e finished the task on time .
⑵ if only 引導的感嘆句：[, , , , , , , , , , , , , , , , , ]
①if only i had a plan !
②if only i had studied hard .
⑶(but for=) if it were not for /if it had not been for ...條件句：[, , , , , , ]
4．目的狀語從句
in case/for fear that(唯恐)/ lest（以免）+ 從句：[, , , , , , , ]
．虛擬語氣在定語從句中的用法:
it is (high) time that -從句 :[, , , , , , ]
①it is time (that) we should go to bed .
②it is time that we went to school.
注意：虛擬語氣的省略：①一般過去時只保留did/could/were等。過去完成時只保留had。③過去將來時只保留could/might/would。
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