• done: *suggest/*insist/propose/desire/demand/request/order/advise/require/command/arrange等 词的过去分词
It is demanded that he (should) leave at once.
表示惊奇、不相信、惋惜等的从句中
巩固练习
1. If I _________ where he lived, I __________ a note to him.
A. knew, would
B. had known, would have sent
C. know, would send
D. knew, would have sent
SITUATION ONE:状语从句
条件状从 if
注意:虚拟语气中的倒装句
条件从句谓语中的were/had/should提到主语之前,此时应将if省去,形成部分倒装
Had you invited us, we would have come to your party.
练习1 使用动词的正确形式填空
SITUTATION THREE:特殊句式
It is (high) time that sb. did/ should do... It is time that everyone should work hard.
注意:that此时引导定语从句表示时间,相当于when
would/could/might/should/needn’t have done
6. I ________ him the answer ________ possible, but I was so busy then.