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[析] at the moment 其意为"现在，当时"，而in a moment意为"马上过一会"，与in a minute意思相近。
[误] The train from Shanghai will arrive here in time.
[正] The train from Shanghai will arrive here on time.
[析] on time为"准时"，而in time有两个含意。其一是"及时"，如：The doctor arrived in time。其二是"将来，终究"。
[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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