There are plenty of tomatoes in the fridge.You should not buy any.Its a hospital.You mustn't smoke.He had been working for more than 11 hours.He must prefer to get some rest.I can speak Arabic fluently when I was a child and we lived in Morocco.But after we moved back to Canada,I had very little exposure to the language and forgot almost everything I knew as a child.Now,I just say a few things in this language.The teacher said we must read this book for our own pleasure as it is optional.But we can read it if we want to.Can you stand on your head more than a minute?No,I cant.If you want to learn to speak German fluently,you need to work hard.Take an umbrella. It might rain later.You shouldn't leave small objects laying around.Such objects may be swallowed by children.People may not walk on grass.Drivers must stop when the traffic lights are red.May I ask a question?-Yes,of course.You needn't take your umbrella.Its not raining.Can you speak Polish?No,I cant.
2. watched, had gone
3. had made, phoned
4. was tired, had studied
5. had ridden, met
6. had phoned, left