Ответ:

1. If you boil water, it turns to steam(0)

2. If I were an astronaut, I would take the photos of Turkey from space(2)

3. If you put a stone in the water, it goes down(0)

4. If you put oil into water it floats(0)

5. If there were no water on earth, we wouldn't exist(2)

6. If you were a bird, where would you fly to?(2)

7. Anna will pass the test if she studies hard enough(1)

8. If you heat ice it melts(0)

9. I wouldn't do that if I were you(2)

10. If he gets any worse I will take him to the doctor's(1)

11. If the snow gets any worse we will have stop walking(1)

12. If ice melts, it turns to water(0)

Объяснение:

конструкция 0 conditional: If+present simple/+present simple. используем для описания очевидных вещей, научных фактов (например: if you heat ice it melts. Если ты согреешь лёд он растает)

конструкция 1 conditional: If+present simple/+will. его используем для возможных событий (например: if she studies well she will pass her exam. Если она хорошо учится то она сдаст экзамен)

конструкция 2 conditional: If+past simple/+would+infinitive. используем для воображаемых ситуаций (например: if i were you i would dump him. Если бы я была тобой, я бы его бросила)