I must clean them.

We must go to the bank today.

I must hurry.

I mustn't forget to phone Julia.

You mustn't be sad.

You mustn't touch the pictures.

You must learn to drive.

My father is going to buy me a bike.
(Babam bana bisiklet alacak.)

You really must read this book.

You must be joking! --> Şaka yapıyor olmalısın!

'm already late, I must fly. --> Çoktan geç kaldım, uçmalıyım.