Hello Khelagor,
I see you are new to the forums. Welcome. If you want people to respond to your posts, you must make sure you do not have the box checked that will keep people from replying.
You are asking about the verb "to have" and its various forms. It's a pretty large topic.
To start with, in the present tense:
I have a question. This is the same for You, We, or They. (We have several questions.)
He has a question. Only in the 3rd person singular is it different.
You need to consult your grammar book about how the verb "to have" is used to form past tenses - present perfect, past perfect, etc. As I said, it's far too big a question for one post.