They have been good friends since they met at a meeting.
自从在一次会议上见面以来,他们就一直是好朋友。
Up to now,the program has saved thousands of children
who would otherwise have died.(摘自2010山东高考)
到现在为止,该项目已救助了上千名孩子,不然他们就
会死亡。 (3)下列句型中常用现在完成时。
①It is (has been)+一段时间+since从句
This (That/It) is the first (second ...) time+that从句
This is the first time we have seen a film in the cinema
together as a family.(摘自2009陕西高考)
这是我们全家第一次到电影院看电影。 ②在条件、时间、让步状语从句中,表示将来某时以前已完成的动作。 —When shall we restart our business? —Not until we have finished our plan.(摘自2010四川高考) ——什么时候我们能重新开始我们的事业? ——直到我们已完成我们的计划为止。 2.过去完成时 (1)过去某一时间或某一动作前已完成的动作或存在的状态。
过去某一时间的动作或状态持续到过去另一时间,还可能持续下去。常与for, since等构成的时间状语连用。 By the time Jack returned home from England, his son had graduated from college.(摘自2011辽宁高考) 到杰克从英格兰返回家园时,他的儿子已大学毕业。 We first met on a train in 2010. We both felt immediately that we had known each other for years. 2010年在火车上我们初次见面。我们当时就觉得我们已经认识多年了。 (2)有些动词有时用过去完成时表示过去未曾实现的希望、 打算或意图。这类动词常见的有:hope, plan, mean, expect, intend, suppose, want, think等。 I had meant to help you, but I was too busy at the moment. 我本想去帮你的,但当时确实太忙了。 (3)在特殊句式hardly/scarcely ...when ...; no sooner ...than
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