1. Richard must like Ice cream
3, They mustn’t chew gum in their class
4. Harry had studied for his math test
5. I rather have order food than cook
1. That may not
2. For
3. Better
4. Been
5. Should
6. Ago
7. Needn’t
8. Yet
9. Never
10. Hasn’t left, Started
Hope this helps I tried my best