firsttime的完成时态是什么？

1.当the first time作连词用,引导一个时间状语从句时,从句一般用过去式,例如：
He fell in love with Mary the first time he saw her.(他对玛丽一见钟情.)
2.当the first time用在“It is/was the first time that……”结构中时,从句一般用完成式.如果前边用“is”,从句用现在完成式；如果前边用“was”,从句用过去完成式.例如：
It is the first time that I have heard the news.这是我第一次听说这个消息.
It was the first time that he had been to Beijing.这是他第一次去北京.

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