It's the first time that I have come here.
it is the first/second/third time+从句【从句用现在完成】
it was the first/second/third time+从句【从句用过去完成】
This is the first time for me to come here .
This is my first time here.
This is my first time, and also the last time to come here.
This is my first time to come here
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