Your friend has invited you to the disco next Saturday but

Будет в форме диалога.
Hello, Alex! I have free Saturday. We can go to the disco. I love it!
Oh, sorry. I cant go. Ill stay with my little sister all the day.
Why cant your parents do this?
They go for a work all day.
Great! So, can I go to you? Ill bye many pizza and chips!
But what about my sister?
Well sit with her! What problems? I have a free day, so I want to spend it with benefit (выгода)! I would like to learn how to treat (обращаться) with little children!
Oh, it would be nice! OK, I wait you on Saturday in my house!
No problems! Goodbye!
Goodbye!