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[误] Till the end of next week. I will have finished this work.

[正] By the end of next week. I will have finished this work.

[析] by 引起的时间状语表示了动作的截止点,其意思为"不迟于某一时刻将工作做完",所以主句一般是完成时态。当然可以有将来时态,如:I'll be there by five o'clock.而till则表达其一动作一直持续到某一时刻,但句中的动词一定要用持续性动词,而瞬间的截止性动词应用其否定句式,如:I won't finish this work till(until) next weekend.

[误] He came to London before last weekend.

[正] He had come to London before last weekend.

[正] He came to London two weeks ago.

[析] before 一般要与完成时连用,而ago则与一般过去时连用。

[误] I have studied English for three years gince I had come here.

[正] I have studied English for three years since I came here.

[析] since用来表达主句动作的开始时间,所以其引出的从句中应为过去时,而不能用完成时态

[误] I can help you repair this bike. You will get it after two hours.

[正] I can help you repair this bike. You will get it in two hours.

[析] 中文经常讲两小时之后来取,两天内会修好,而这个介词在英文中要用in而不要用after。其原因有二,①after 多用于过去时,如:I arrived in New York. After three days, I found a job in the bank. ② after 加时间是表达一个不确定的时间范围,如:after three days, 即三天之后的哪一天都可以。所以在许诺若干时间内会完成某事时,一定要用介词in。

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