If i see someone suicide
I don't konw what to say.
but first all, I will listen to her story
and then I will tell to her that life is very valuable.

I'm sorry that i am late.

Correct:

If I see someone committing suicide,
I don't know what to say.
but first of all,  I will listen to her story
and then I will tell to her that life is very valuable.

I'm sorry I'm late.

Hello Alice! Thank you for submitting your homework on Talk Fun. You have again shared your opinions about this case. I'd like to suggest that please observe capitalization especially the pronoun. In here, I could say that you can compose your own writing. Keep it up! See you in class.