5.whever等一系列连词既可引导让步状语从句相当于no matter wh,也可引导名词性从句。而no matter wh只能引导让步状语从句,不能引导名词性从句。
No matter what happened,he would not mind.=Whatever happened,he would not mind.
考点六 条件状语从句
条件状语从句通常分为两大类:真实条件句和虚拟条件句。引导条件状语从句的连词有:if,unless/ if...not,as long as/ so long as,as far as/so far as,provided/providing(that),on condition that等。
1.条件状语从句中如果主句是将来时,条件状语从句用一般现在时。如果条件状语从句中出现过去式,则为虚拟条件句,那么主句要用相应的虚拟语气形式。
If he is not at home,I will come again.
If he had listened carefully,he would have done it better.
2.unless 相当于if...not,在虚拟条件句中可用if...not,但不能用unless。
You will fail unless you study hard. If she were not too silly,she would understand it.
考点七 目的状语从句目的状语从句常用的连词(短语)有so that(以便),in order that(以便),lest,in case,for fear that...等。
1.so that / in order that 引导的目的状语从句中常用情态动词can,could等。in order that 引导的目的状语从句可以放在主句之前或之后,而so that引导的目的状语从句只能放在主句之后。
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