the first time的句子什么时候用过去时,什么时候用完成时?

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。