Is it OK if I leave now?

我现在离开，可以吗？

Is it OK if I post you the cheque next week?

我下周寄给你支票可以吗？

Is it OK for me to come too?

我也去，行吗？

Is it OK if I borrow the car, Dad?

爸爸，借用一下汽车好吗？

Is it OK if I post the cheque to you next week?

我下周把支票寄给你行不行？