(7)till/until:如果主句动词是延续性动词,常用肯定式,表示“直到……为止”;如果主句动词是瞬间性动词,要用否定式,表示“直到……才”“在……以前不”,从句放在句首表示强调,一般用until。 If a lot of people say a film is not good,I won't bother to see it, or I'll wait until it comes out on DVD。 如果许多人都说一部电影不好的话,我不会费心去观看,或者我将一直等到DVD版本的电影出版。
(8)since的主句动词应为延续性的,从句动词为瞬间性的。状语从句在主句之前时一般用逗号与主句分开,如从句在主句之后则不必用标点符号。 It is three years since he came here. 他来这里已经3年了。 (9)as soon as/hardly...when/no sooner...than/the moment/the instant/the second/immediately/directly/instantly:hardly...when和no sooner...than的意义相当于as soon as,但只表示过去发生的事情,主句为过去完成时,从句为过去时,如hardly或no sooner位于句首时语气强,而且主句的谓语要用部分倒装。 Just use this room for the time being,and we'll offer you a larger one as soon as it becomes available. 仅暂时使用此房间,一旦有了大的,我们就提供给你一个。 He had no sooner finished his speech than the students started cheering. 他一完成演讲学生们就开始欢呼起来了。 Hardly had I got home when it began to rain. 我刚一到家就开始下雨了。 (10)every time/each time/last time/next time/by the time:在时间状语从句中,不能用将来时或过去将来时,而要用一般现在时或一般过去时代替将来时。 Next time you come here,I will tell you. 下次你来这里,我会告诉你的。
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