中考复习－－初中英语常见介词的错误与纠正

　　［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.

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