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1、If 从句主句did (were)would(could/shouldmight)do过去had donewould()have done将来didwere to doshould dowould()do* if从句里有had, should, were, 可省略if, 把had, should, were 提到句首* 用with, without, but for(要不是)， undercondition(在条件下)，but, otherwise, or代替if从句* 错综条件句*注意区分真实条件句常见引导词：if, unless, so/as long as, in case(that),
2、 on condition that, suppose(that), supposing(that), provided(that), providing(that)一、if条件句二、if only, wish, as though(if)wish/if only(如果就好了)as if/ as thoughdid(were)与现在事实相反did(were)had done过去had donewould/could/might do将来-三、suggest 等 （should）do/be done一坚持 insist二命令 order, command三建议 advise(advice), s
3、uggest(suggestion), propose(proposal)五要求ask, require(requirement), request, demand, desire, urge.几种常见形式（suggest为例）Many students suggest thatthe sports meeting should be held. （宾从）It is suggested (by many students ) that (主从，it形主)Many students made the suggestion that（同位从）Many students suggestion is that（表从）Exception（例外）Suggest 表示“暗示，表明”Insist 表示“坚持说，坚持认为”The young man insisted that he had done nothing wrong and should be set free.四、It is time that sb did/should doIt is time that I went now.It is time that I should go now.It is time for me to go now.
