［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.?

［析］ every three days 为每三天，即每隔二天，而every other day为每隔一天。

［误］ He didn't go to the cinema yesterday. and I didn't go, too.?

［正］ He didn't go to the cinema yesterday and I didn't go either.?

［析］ 英语中表示也，有4个字，also, as well, too, either，但either用于否定句中，而前3个用于肯定句中。在肯定句中too与as well一般要用在句尾，而also则可用于句中。如：She went to the party and her boy friend went there too. 又如： I've also read her other novels.?

［误］ We should help the poor girl in anyway.?

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