1. I must / have to visit my friend. It is her birthday.
2. I can / must pay your rent. That’s the rule.
3. You mustn’t / can’t eat in the classroom. It’s forbidden.
4. Sally is ill. She has to /mustn’t stay in bed.
5. Can / Must I stay out late tonight?
b)The horse is bigger than the cat and bigger than the mouse.
2)a)The pig is the dirtiest the hare is the cleanest and the bear is cleaner than the pig but dirtier than the hare
b)The pig is dirtier than the bear and the hare
3)a) The pen is longer than the short pencil but shorter than the 20sm ruler
b) The pencil is the shortest one and pen is longer than pencil but shorter then the 20sm ruler
4)a)sad Bob is sadder than happy Mary and Happy Max
b)Mary is sadder than Max but happier than Bob