[误] I met an old friend sometimes last month.?
[正] I met an old friend sometime last month.?
[析] Sometime 过去,或者将来某时。?Sometimes 有时?
如: Sometimes I go to school by bus.?Some time 一些时间 ?
如: I need sometime to do my homework.? Some times 几次 ?
如: I went to Shanghai sometimes this month.?
at times 有时,偶尔?
at all times 经常?
some other time 改天 ?
[误] I had met an old friend three days ago.?
[正] I had met an old friend three days before.?
[正] I met an old friend three days ago.?
* ago 用在时间状语中时,主句中谓语动词一般用过去时,而before用于时间状语时则主句的谓语动词宜用完成时态。?
[误] He studied very hard. and at the end he passed the exam.?
[正] He studied very hard, and in the end he passed the exam.?
[析] in the end=at last 意为最终,终于,表达经过若干努力而达到的结果。而at the end是在某事的结束时如何如何,如:At the end of class, the teacher gave us some story books。?
[误] I will come here to help you each three days.?
[正] I will come here to help you every three days.?
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