是不是the first time用过去式 for the first time 用现在完成时

不是哦~两者其实相等滴!
for the first time和the first time 意思都是“第一次”
用the first time 情况举例如下：
Is it the first time you come to China?
您是第一次来中国吗?
9.It is the first time for him to travel.
他是第一次旅行.
the first time举例如下：
be performed for the first time
He came to the countryside for the first time 不一定是完成时
以上两个例子你看懂了嘛?