[正] After school some students play football, while others go to the library.
[析] while在此处意为而,然而。
[误] She sang when she walked along the dark street.
[正] She sang as she walked along the dark street.
[析] as用于句中时,其要点是强调两个动作的同时进行。这里用when虽然不能讲是语法上的错误,但则看不出来小女孩因独自走黑暗的街道因害怕而唱歌的心情。
[误] I finished my homework until twelve oclock last night.
[正] I didnt finished my homework until twelve oclock last night.
[正] I did my homework until twelve oclock last night.
[析] until用在句中时其含义是某一动作一直持续到某时结束,那么句中的动词则一定要用持续性动词,如果要用瞬间,或截止性动词时一定要用否定句式。因截止性动作的否定式应看作是持续性的动作。如离开leave是瞬间动作,因一出门即为离开了,而不离开则是长时间的。
[误] I have studied English when I was twelve.
[正] I have studied English since I was twelve.
[析] since引出的时间状语从句是表达了一个时间点,而这个时间点是主句动作的启始点,所以主句一般要用完成时态。
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