Ex.2.1.

1. The mechanic fixed my car yesterday.

2. The car stopped at a red light.

3. The students enjoyed the concert.

4. Mr. and Mrs.Ross invited 30 people to their party.

5. I painted the bedroom last weekend.

6. Columbus discovered America in 1492.

7. The movie started ten minutes ago.

8. Ronald lived in California from 1960 to 1970.

9. His father died in 1963.

Ex.2.3.

1. I didn't study last night.

2. He didn't walk to class.

3. I didn't finish my lesson.

4. I didn't like that movie.  

5. The bus didn't stop

6. It didn't rain yesterday.

7. They didn't answer all the questions.

8. He didn't miss the bus