Question

for the first time 用法.

Answer 1

for the first time i felt that i had achieved something.

这句话没错!

for the first time 没有时态限制.

这句felt 指过去,had achieved 是先于felt 发生的,指“过去的过去”,当然用过去完成时

也可用于其它时态,如：

I'll go there for the first time.

不过,在It/This/ That is the first(second...) time + 从句.这个句型中,如果从句的动作已经发生,一般用完成时,如：

It is the first time I have visited the city.