三、用于as if,as though等引起的状 语从句
1.与现在的事实不符，用一般过去式 2.与过去的事实不符，用had+过去分词 He often treats me as if I _____(be) a
child. Peter talked as if he _____(be) there
really.
四、用于表示要求、建议、命令等意义的词后的各 种从句，谓语用should+动词原形，should 可省略
动词 suggest, advise, demand ,require, request, order ,command, insist
名词 advice, suggestion, demand, requirement, request, order, command, insistence
If you missed the chance, you _____(feel) sorry for it.
If I ________(be) more careful, I would not have made so many silly mistakes.
一.用于if引起的非实的条件句
more than 1000 yuan each month ____(have) pay income taxes. What ______(happen) if you did not observe the traffic rules?
一.用于if引起的非真实的条件句
1）与现在事实相反的假设，从句的谓语动词 用一般过去时（be 的过去式是were)，主句的 谓语动词用would(should, could, might)+动词原 2形）与过去事实相反的假设，从句的谓语动词 用“had+过去分词”，主句用“would(should , could, might)+have+过去分词
trip. His suggestion is that we _____ (go) out on
picnic next Sunday
五、用于其他各种从句
1.用于主语从句，It’s important, natural , necessary, essential +主语从句（谓语动词用 should+动词原形）
二、用于wish后宾语从句
1）表示与现在的愿望相反，谓语动词用 一般过去式
2）表示与过去的愿望相反，谓语动词用 “had+过去分词 ”
3）表示与将来的愿望相反，谓语动词用 “would(could,might)+动词原形
I wish I ____(be) young forever. I wish I ______(tell )him the news.
形容词advisable, desired, demanded, ordered, required, suggested
Example
He insisted that we ____(be) in his office at six.
It’s required that the machine___(be)tested. The doctor suggested that she ____(take)a
3）与将来发生的事实可能相反的假设，从 句的谓语动词用一般过去时、should(were to) +动词原形，主句用“would (should, could, might）+动词原形
Example
The spaceship would burn up if it ____(go) to close to the star.
4. He took his umbrella with him in case it ____(rain).
2.用于It is (high) time 所引起的定语从句（谓语 动词用一般过去式）
3.用于would rather, would prefer等引起的状语 从句
1)与过去事实相反,谓语动词用had+动词原形 2)与现在事实相反,谓语动词用一般过去式 用于lest, in case引起的状语从句,谓语动词
用”should+动词原形”, should 不可以省.
Example
1. It’s high time we ____( go) back to college.
2. I would rather you _____(not tell ) him anything about it.
3. She would prefer that she ______(not stay) at home last night.
Grammar : Subjunctive Mood
Example Isn’t it high time we_____ (live)
responsibly, with our nation’s future time. It’s required that anyone who has earned
4)条件句中的连词if可省略,但从句要倒装, 即将were, had, should 等置于主语前.
5)有些条件句不用if引出,而用without, but 等引出
But for the rain, we _______(go) down to the country.
_____(be) he here this afternoon, I would go with him.