Look at these rules for the computer game. Write sentences with ‘must’ and ‘mustn’t’.

Example 0. Find the magic key.

Answer 0. You must find the magic key.

1. Open only one red door.

You must open only one red door.
You must open only one red door

2. Give the coins to the old man.

You must give the coins to the old man.
You must give the coins to the old man

3. Don’t open the window on the third floor.

You mustn’t open the window on the third floor.
You mustn’t open the window on the third floor