for the first time和the first time和at the first time有什么区别?

For the first time 是adv 第一次，首次，第一次(做某事)，做状语。
The first time 第一次。是从属连词，引导时间状语从句。
At the first time 接过去时，放在句首。指在第一次。

for the first time和the first time均意为第一次，只是在句中的位置不同，一般for the first time放在句尾，the first time放在句头句尾都行~
at the first time意为起初~

例
The first time he came,I knew what he wanted.
When he came for the first time,I knew what he wanted.
At the first time,I didn't know what he wanted.
for the first time 做时间状语,意思为第一次
the first time 做状语从句的连接词,放在从句前
at the first time 做时间状语,意思为起初

1.第一次（作状语）例：I fell in love with you for the first time.
2.第一次/第一时间 例：The first time i saw you is on....
3.没查到，估计应该没有这个词组吧，不好意思！