Answer:
1. My school did not celebrate National Day last week.
2. The students do not sing the national anthem.
3. The girl does not dance on the stage.
4. The boy did not give a speech on the stage last month.
5. The headmaster does not announce the winner.
6. My friends and I do not win the contest.
7. The tiger did not fall into the trap last night.
8. The fisherman does not return to the beach in the evening.
1. The boy is not reading books in the library.
2. The girl was not doing homework in the room yesterday.
3. The puppies are not playing under the tree.
4. The kittens were not running on the roof last night.
5. The bird is not resting on the tree.
6. The women were not washing clothes by the river last month.