the first time相当于一个连词，后加从句，它也可以作名词for the first time在句子中作状语比如：I thought her honest ___ I met her.A. first timeB. for the first timeC. the first timeD. by the first time该题选C，意思是：第一次和她见面时, 我就认为她诚实。

第一次”英语为the first time, the first time I met her相当于when I first met her。for the first time的意思是 “作为第一次”。又比如: He cast his net for the first time. 他撒了第一网。for the first time的作用相当于一个副词。知道了吗？