Choose the correct sentence: If I see him I gave him your message., If I see him I give him your message., If I see him then I will give him your message., If I see him I will be given him your message.

If I see him I gave him your message.

If I see him I give him your message.

If I see him then I will give him your message.

None of these

If I see him, then I will give him your message.

This is a Type 1 conditional (real possibility in the future): If + present simple, will + base verb.

"Will give" is the correct future tense; the subject is "I" and the object is "him".