英語語法講解:虛擬語氣(第四講)
一、虛擬語氣用于主語從句中
在It is (was)important (necessary, desirable, imperative, advisable, incredible, urgent, possible, essential, natural, preferable, insistent, crucial, better, best, ridiculous, vital) that…能及It is (was) a pity (shame, wonder, must, suggestion, proposal, requirement, request, desire, order, recommendation) that….,It is (was)desired (arranged, decided, ordered, proposed, requested, recommended, suggested, settled) that…等句型的主語從句中，其謂語用“should+動詞原形(其中should可以省略)”來構成虛擬語氣。
例：It is important that we (should)speak politely.
我們說話要有禮貌，這是很重要的。
例：It is essential that she these application forms be sent back as early as possible.
將這些申請表格盡快地反饋回來是很必要的。
二、 虛擬語氣用于賓語從句中
當動詞ask, arrange, beg, advise, command, deserve, direct,desire, demand,determine, move, prefer, propose, intend, request, require, suppose 等后面接賓語從句時，從句的謂語用”should+動詞原形” 來表示虛擬語氣。
例: The judge ordered that the prisoner(should) be remanded.
法官命令被告還押。
Mr.Chairman, I move that the money____for library books.
主席先生，我提議把那筆錢用來購買圖書館書籍。
經典練習：
1、It is vital that enough money____ to fund the project.
A)be collected
B)must be collected
C)is collected
D)can be collected
2、It is recommended that the project____until all the preparations have been made.
A)is not started
B)will not be started
C)is not to be started
D)not be started
3、The manager of the hotel requests that their guests____afeter 10:30 p.m.
A)couldn’t play loud music
B)don’t play loud music
C)shouldn’t play loud music
D)not to play loud music
解析：
1、選A)。本題中vital后的主語從句用“should+動詞原形”的虛擬語氣形式，省略了should，來構成從句的謂語，符合語法規則，為正確答案。
2、選D)。動詞recommend表示“建議”，其后的賓語從句須用“should+動詞原形”的虛擬語氣形式，should可以省略。所以C為正確答案。
3、選C)。在本題中，動詞request后的賓語從句用”should+動詞原形”的虛擬語氣形式，并且是否定形式。
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| 英語語法講解:情態動詞(第十講) 英語語法講解:情態動詞(第九講) 英語語法講解:情態動詞(第八講) 英語語法講解:虛擬語氣(第七講) 英語語法講解:虛擬語氣(第六講) 英語語法講解:虛擬語氣(第五講) |
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