Read the story about Jack. Look at the sentences. If the sentence is true, do not change it. If it is

wrong, write
the negative.

1. His alarm clock didn't go off.

2. ( no change )

3. He didn't cook a big breakfast.

4. He didn't wash the dishes.

5. ( no change )

6. He didn't see his friends at the bus stop.

7. He wasn't late for work.

8. It wasn't time for work.

(Tư liệu tham khảo: Betty Schrampfer Azar . Understanding and Using English. 3rd ed.)
Review exercise