future conditionals

I have a question for native speakers of English. Please don't answer according to grammar rules. Just tell me what verb form you would naturally use in your everyday spoken or informal written language (even if some might consider it wrong). The question is to complete the following:
"There's no doubt he's going to be here tomorrow. And if he ______ here, she'll have a chance to meet him."

"There's no doubt he's going to be here tomorrow. And if he is here, she'll have a chance to meet him."

If he comes here, she'll have a chance to meet him."

"And if he comes here, she'll have a chance to meet him."

Sorry, I missed you had asked your question in a separate thread.

Compare and see the difference:

1. What will you say when he comes? — Present Simple
2. Do you know when he will come? — Future Simple

HTH

What I thought of first was "is". I wouldn't, however, give the thumbs down to "comes".

Besides the use of "comes", which works in this particular instance but is not as generally applicable, I myself would just use "is" here.

Couldn't one say the following?
"There's no doubt he's going to be here tomorrow. And if he's going to be here, she'll have a chance to meet him."
If not, why?

Your suggested sentence sounds monotonous and repetitive. "he's going to be here" is repeated in both setences and sounds wordy. Though it may put across the idea to the listener.

I hope it helps.

Then let's change the sentece to:
'You say he'll certainly come. Well, if he'll be here tomorrow, she'll have a chance to meet him.'
Isn't this a way of showing that the speaker has accepted as a fact that he'll be here tomorrow, and is drawing a conclusion from this premise?