II. Put the verbs in brackets into the correct form.

1.  We ____________ (stay) at home if it rains.

2.  She will call you if she ____________ (have) time.

3.  If it _________ (not rain) tomorrow, we will go for a picnic.

4.  If everyone _______(recycle) paper, metal and glass, we _____ (not produce) so much rubbish.

5.  If you ________ (not water) plants, they ________ (die).

6.  If the weather __________ (be) bad, we ________ (not go) to the park.

7.  We _____ (save) thousands of trees if we _______ (not waste) so much paper.

8.  What _______ (happen) if we _______ (keep) polluting the environment.

9.  If we ________ (not stop) cutting down so many trees, we ______ (endanger) our oxygen supply.

10. If people ________ (dump) chemicals into rivers, they _______ (not be) able to swim in them in the future.