Ответ:

1)If I were you, I would wash it.

2)If I were you, I would buy new ones.

3)If I were you, I would see a doctor.

4)If I were you, I would phone them right now.

5)If I were you, I would prepare all night.

6)If I were you, I would ask for some help.

7)If I were you, I would go and bring some snacks.

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Second Conditional.

If + past simple + would + verb.