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.
Second Conditional.
If + past simple + would + verb.