现在完成时中的for和since有何区别举例加
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现在完成时中since和for的区分
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for+时间段。
He has been in the army for three years.
since+时间点或句子。
He has been in the army since three years ago.
They haven't seen each other since he left three years ago.
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for +时间段
since +时间点
since +时间点
追答
如:
He has lived here since three years ago.
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