How to use "I get to"?

No, it means you are allowed to do something. Some has let you or given you the opportunity to do something.

I get to play Romeo in this year's play. (the teacher choose me to do it)

He gets to go but I don't. (Mom said he could go because he is older but I'm too young.)

Woww, I see

Thank you ^^

He gets to go but I don't. (Mom said he could go because he is older but I'm too young.)

Should I use "He got to go" because Mom said in the past?

Depends. If you're talking about an event in the past it would be :

He got to go to the rock concert last week, but I didn't. Mum said he got to go because... (etc)

If it's not past (regular or future), as in Mark's example, then gets to express the time of the event, or got to concord with the verb said are both possible.

He gets to go to the rock concert next week. Mum said he gets/got to go because ...(etc)

I think you asked the same thing in one of your past questions - ?? Look back and you'll find the explanation there.

thadajirajaras wrote:Should I use "He got to go" because Mom said in the past?

Maybe you are confusing "have got to ~" with "get to ~"

"have got to ~" is the same as "have to"

Comparison examples:
I've got to present this report on Friday. (I must do it on Friday.)

I get to present the report on Friday. (My boss is letting me/giving me the chance to present the report.)