1. Don't break
2. Doesn't rain
3. Don't be

11.If  you   won’t  check  the car, it …… (not/break) down in the middle of the desert.
=> won't break

12.If  it ........... (not/rain), the children would play outside.
=> hasn't rain

13.If  my parents ........... (not/be) so tired, they will  watch the film on TV.
=> aren't 

11.If you  check the car, it …won't break… (not/break) down in the middle of the desert.

12.If it .....doesn't rain...... (not/rain), the children would play outside.

13.If my parents .....don't be...... (not/be) so tired, they will watch the film on TV.