Asking for permission

Sara - Mum, can I go to a party with Laura on Friday?

Magalí - Yeah, sure.

Sara - Cool, Oh, and can I stay at Laura's house after the party?

Magalí - No, you can't.

Sara - Why not?

Magalí - Because we're going to grandma's house on Saturday.

Sara - Ok. Er, one more thing. Can I borrow 5$ please?

Magalí - Ok. here you go. I'll lend you the money if you promise to come home before 12 o'clock !

Sara - Ok. I promise. Thanks, mum.