siusiu in English:

I’ve got to pee

I have to pee / I must take a pee

Do I have time for a pee before we go?

I need to pee, just give me a minute. I'll go to the restroom.

I'll be back in a minute, I need to pee.

pee in the loo

The little boy peed his pants.

I have to pee. "Jonny, that's not the right thing to say. Say, 'Excuse me. I need to go to the toilet.'"

I have to pee, but your friends are completely crowding the hallway.