1 语法考点之一 :虚拟语气 考点1
If 从句中的虚拟语气 1、与过去事实相反:从句sb had done,主句sb would(should, could, might)+ have done; 2、省略 if,从句的语序用到装,即将 were, had 或 should 移至主语的前面,但否定词 not 不前移
3、与将来事实相反:从句sb did (should+do 或 were+to do),主句sb would (should, could, might)+do
4、错综条件句:主句与从句的动作发生在不同的时间段
比如:从句对过去虚拟,而主句对现在虚拟,即从句sb had done,主句sb would(should, could, might)+do; 考点2:表示建议、要求、命令等动词如 insist, order, command, suggest, advise, propose, ask, require, request, demand 引导的从句及 it 引导的相应的分词、名词和形容词从句,谓语用(should)+动词原形
考点3:It is +advisable, essential, important, imperative, incredible 等从句,谓语用(should)+动词原形
考点4:it is (high/about) time that 的结构中,从句使用一般过去式
例如: 考点5:much as"尽管,虽然"引导让步状语从句,从句中用 would have done 表示假设
考点6:if only, wish, as if/as though 引导从句, 与过去事实相反:had + done; 与现在事实相反:动词过去式; 与将来事实相反:could/would + do 考点7:would rather