Questions & Answers about Je suis ici pour toi.
Why is it toi instead of tu in this sentence?
In French, tu is only used as the subject of a verb, like when you say tu es (you are). When a pronoun comes after a preposition like pour (for), you must use a special form called a stressed pronoun. The stressed pronoun for the informal "you" is toi.
I learned that te also means "you" as an object. Why not use te here?
You use te when "you" is the object directly tied to a verb, and it usually goes right before that verb (for example, je te vois means "I see you"). Because "you" comes right after the preposition pour in this sentence, it requires a stressed pronoun (toi) rather than a normal object pronoun.
How would I change this to say "I am here for him" or "for her"?
If I want to be polite and use the formal "you", does toi change?
Yes. If you are speaking formally to someone, or speaking to a group of people, you use vous. The stressed pronoun for vous is exactly the same word, so the polite version of this sentence is simply Je suis ici pour vous.