Question

it is the first/my first time that 后面从句是不是一定要用完成时

Answer 1

It is the first time that+现在完成时，it was the first time that+过去完成时，这两个都是固定的句式，用于写作常会因此而得到青睐甚至加分。

Answer 2

it is the first time that+现在完成时

追问

谢谢你

追答

it wad the first time that+过去完成时

追问

那

追答

it was the first time that+过去完成时

追问

it ismy first time 是不是后面接 to do sth

追答

是的，it 做形式主语

Answer 3

是的

追问

那 it is my first time to....呢

追答

这不是上面说的情况啊

追问

我知，我在问这个情况

追答

上面说的是it is the first time that。。。
that从句中要用现在完成时

it is my first time to do sth

追问

上面的我明白了，那这个情况呢