IV.
1. When we visit a foreign country, we must have a passport.
2. If the traffic light is red, the drivers must stop their cars.
3. If you want to borrow a book from the library, you must go there.
4. If you want to become a cosmonaut, you must eat healthy food.
5. Come to school in time. You must not be late.
6. In our school, we must wear uniforms.
7. Be careful. You must not play with matches.
V.
1. We went to school yesterday.
2. We took a nap yesterday.
3. He caught a fish yesterday.
VI.
thin
short
ugly
warm
big
VII.
were
worked
began
gathered
walked
had
made
