Make the sentence negative and interrogative: 1 .It is cold today.
2. It is time to go home.
3. It was too late to ring them up.
4. It will over soon
5. It is getting dark
6. It rained yesterday.
7..It often snows in winter
8. it was simple to translate this article.
9. It becomes cool in September.
10. It will be difficult to solve the problem.
11. It gets warm in spring.
12. It became dark at six o'clock
13. It is getting difficult to go.
14. It has become cold.
15. It was strange to see here.
16. It will freeze in January.​

Negative:
1 .It is not cold today.
2. It is not time to go home.
3. It was not too late to ring them up.
4. It will not over soon
5. It is not getting dark
6. It did not rain yesterday.
7..It does not often snow in winter
8. it was not simple to translate this article.
9. It does not become cool in September.
10. It will not be difficult to solve the problem.
11. It does not get warm in spring.
12. It did not become dark at six o'clock
13. It is not getting difficult to go.
14. It has not become cold.
15. It was not strange to see here.
16. It will not freeze in January.

Interrogative:
1 . Is it cold today?
2. Is it time to go home?
3. Was it too late to ring them up?
4. Will it over soon?
5. Is it getting dark?
6. Did it rain yesterday?
7.. Does it often snow in winter?
8. Was it simple to translate this article?
9. Does it become cool in September?
10. Will it be difficult to solve the problem?
11. Does it get warm in spring?
12. Does it become dark at six o'clock?
13. Is it getting difficult to go?
14. Has it become cold?
15. Was it strange to see here?
16. Will it freeze in January?