②till、until均表示“到……时候止”,肯定句中的谓语必须是延续性动作。如:I worked till late at night.若主句谓语是终止性动词,则主句要用否定形式,意为动作“到……才……”开始发生。如:
She didn’t get up until her mother came in.
注意:till和until通常情况下可以互换,只是在句首时until比till更常用。
③though、although均引导让步状语从句,意为“虽然……”,although较正式,though最常用。如:
Thouth (Although)he was tired,he kept on working.
注意:though、although引导的从句不能与but、however连用,但可以与yet、still连用。though还可以与别的词结合使用,如even though、
as though,而although则不能这样搭配。
④no sooner … than、hardly … when、as soon as三者都表示“一“刚刚……就”的意思。(A)as soon as 置于主句前后都可以,而且有备各种时态。如:As soon as she gets here I’ll tell
her about
it. Mary left as soon as the finished the work.(B)hardly … when、no sooner … than不能表示将来的事,其主句的谓语动词一般用过去完成时,从句用过去时。若将hardly或no sooner放在句首,句子要倒装。如:No sooner had he arrived than he went away again.
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