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是跟时间状语有关,如果你见到;for +时间段,since +时间段或时间点,ever, never, yet, just,how long等,一般是要现在完成时,而且现在完成时虽然动作发生在过去,但对现在是有影响的。如:I have had this book for ten days. I have been to Shanghai。 一般过去时的时间状语是:yesterday, last year. in 1897, 等就要用过去时。如:I went to school yesterday.
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