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9 虚拟语气在状语从句中的用法
与现在事实相反的假设 与过去事实相反的假设 与将来事实相反的假设 虚拟条件句 过去时 过去完成时 过去时/should do/were to 主句 would/could/might do would/could/might have done would/could/might do ①错综时间条件句(动词的形式要根据它所表示的时间作出相应的调整)。
②if省略句(在条件句中可省略if，把were，had，should提到句首，变为倒装句)。 ③用介词或介词短语代替条件状语从句。常用的有with，without，but for。 ④含蓄条件句。用otherwise或but来体现虚拟语气。
用所给词的适当形式填空：
①If you ________(go) to bed earlier last night，you ________(not be) sleepy now.
②If you________(not attend) the meeting yesterday，you________(not meet) him. ③I ________(be) ill yesterday. Otherwise，I ________(go) there.
④I ________(give) you more help，but I was too busy.
⑤But for the rain last Sunday，we ________(have) a picnic.
【答案】①had gone；wouldn't be ②hadn't attended；wouldn't have met ③was；would have gone ④would have given
⑤would have had
10 as if/as though的用法
as if/as though引导的从句表示的情况可能会发生用陈述语气，表示的情况不可能发生则用虚拟语气。
用所给词的适当形式填空：
①It looks as if it ______________(rain)．
②He speaks Chinese so fluently as if he ________(be) a Chinese. ③They talked as if they ______(be) friends for many years. 【答案】①is going to rain ②were ③had been
11 If only...！句型的使用
If only＋句子＝How I wish＋that从句，句中用虚拟语气。
用所给词的适当形式填空：
①If only I ________(be) a flying bird! ②If only I ________(go) home tomorrow! ③Look at the terrible situation I am in！If only I ________(follow) your advice. 【答案】①were ②would go ③had followed
12 虚拟语气在名词性从句和固定
句型中的使用
①表示建议、愿望、命令等词的名词性从句中，常见的词有demand，order，require，requirement，insist，suggest，suggestion，propose，proposal，advise，advice，recommend，desire，request，urge等，从句虚拟语气结构为 “should＋动词原形”，should可以省略。
②It is desired/suggested/proposed/necessary/important/strange/natural/essential/...＋that从句，从句中的谓语用“should＋动词原形”，should可以省略。
③wish (that) sb. did(表现在)/had_done(表过去)/would_do(表将来)(三种虚拟形式)
④would rather (that) sb. did(表现在和将来)/had_done(表过去)(两种虚拟形式) ⑤It's (about/high) time that sb. did sth./sb. should do sth.
用所给词的适当形式填空： ①His face suggested he ________(be) ill and we suggested that he ________(send) to hospital.