时常与具体的时间状语连用,而现在完成时通常与模糊的时间状语连用,或无时间状语。?◎一般过去时的时间状语有: yesterday, last week ,… ago, in1980, in October, just now, 等具体的时间状语。?◎共同的时间状语有: this morning, tonight, this summer, before, already, 等。 ?◎现在完成时的时间状语有: for, since, ever, never, just, already, yet, in past years 等不确定的时间状语。请大家认真分析比较下列各例句: 请大家认真分析比较下列各例句: ? I saw this film yesterday. ?(只说明动作发生在过去。) ? I have seen this film. ?(强调对现在的影响,电影的内容已经知道了。) ? She has returned from Paris. ?(她已从巴黎回来了。) ? She returned yesterday. ?(她是昨天回来的。) ? He has been in the League for three years. ?(在团内的状态可延续)? He joined the League three years ago. ?( 三年前入团, joined 为短暂行为。) ?注意: 句子中如有一般过去时的时间副词(如 yesterday, last week, in 1960 )时,不能使用现在完成时,要用过去时。例如: ?(错) Tom has written a letter to his parents last night. ?(对) Tom wrote a letter to his parents last night.
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