[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。?
[误] Three days after he died.?
[正] After three days he died.?
[正] Three days later he died.?
[析] after 与 later都可以用来表达一段时间之后,但它们所处的位置不同,after 在时间词前,而later在时间词后。?
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