itraintomorrow,themeetingwouldbeputoff.A．Should  ...

問題詳情：

       it rain tomorrow, the meeting would be put off.

A．Should                                                     B．Would

C．Could                                                       D．Must

【回答】

A

【解析】

本題考查與將來事實相反的虛擬語氣，故從句用should + v原形。句意：如果明天下雨，會議將會被推遲。此處是if引導的非真實條件句，如果把if省略，則將情態動詞should提到主語的前面。故選A。

【點睛】

if 的虛擬語氣講解

1.對現在情況的假設：表示說話時不存在或與事實相反的情況.形式：If+主語+did,主語+should/ would /could +do.例句：If you knew english well,you would be able to talk with foreigners freely.

2.對過去情況的假設：表示與過去事實相反的情況.形式：if+主語+had done,主語+should/would /could+have done.例句：if i had not studied hard ,i might have failed in the exam.（事實是我通過考試了）

3.對將來情況的假設：表示將來實現可能*不大的情況.形式：if+主語+did/were to do /should do,主語+should /would /could do.例句:if he should change his mind ,what would we do?

if的省略：在正式文體中,有時可把虛擬條件句中的連詞if省去,這時從句需要採用倒裝語序,即：將were,had,should等助動詞提到主語前面,主句不做任何變化.例句：should it rain tomorrow,we would staly at home.

錯綜時間：所謂錯綜時間是指主句和從句的動作不是發生在同一時間.這時,需要根據意思選用表示不同時間的虛擬語氣形式.例句：if i were you ,i would have taken his advice.（從句表示現在時間,主句表示過去時間）,我要是你,就聽他的忠告了。

知識點：虛擬語氣與情態動詞

題型：選擇題