虚拟语气一、以 if 条件从句为虚拟语气标志时态从句动词形式主句动词形式与现在事实相反didwould/could/should/might do与将来事实相反(1)did(2)were to do(3)should dowould/could/should/might do与过去事实相反had donewould/could/should/might have done含蓄条件句有时虚拟语气并不总是用 if 引导的条件句来表示，而是通过一些词或短语表示出来。这些词 或 短 语 引 出 的 条 件 与if引 导 的 条 件 句 意 义 相 似 ， 如but for，with，without，otherwise，or，but 等。其中 but for 相当于 if it were not for/if it had not been for，表示“要不是……”。He wouldn’t have survived but for the neighbour’s timely help.二、suggest 等动词及其相应的名词后跟的从句中虚拟语气的用法1．宾语从句suggest 等表示建议、愿望、命令等的动词后跟的宾语从句要使用虚拟语气，从句谓语的结构为“should＋动词原形”，其中 should 可以省略。The doctor suggested that he (should) take more rest.2．主语从句在“It is/was suggested＋that 引导的主语从句”中，主语从句要用虚拟语气， 即“should＋动词原形”结构，其中 should 可以省略。另外，在“It is/was important(necessary，desirable，advisable 等)＋that 引导的主语从句”中，从句也常用虚拟语气，谓语用“should＋动词原形”结构，其中 should 可以省略。It is suggested that the building (should) be pulled down.It is necessary that a doctor (should) be sent for at once.3．表语从句当 suggestion，order，proposal，demand 等名词作主语时，其后的表语从句中要用虚拟语气“should＋动词原形”结构，其中 should 可以省略。My advice is that you (should) give up smoking.4．同位语从句在 suggestion，advice，order，proposal，demand 等名词后跟的同位语从句中要用虚拟语气，谓语用“should＋动词原形”结构，其中 should 可以省略。His suggestion that we (should) set off at 5∶00 a．m.is not good enough.三、虚拟语气的特殊句型1．It is (high/about) time (that) sb.did sth.It is (high/about) time (that) sb.did sth.2．would rather (that) sb.did sth.I’d rather you left tomorrow.1．Ge...
