V+(으)면 안 되다 ~ You shouldn’t V, you’re not supposed to V

To say “you’re not supposed to V” or “you shouldn’t V”, we can add (으)면 안 되다 to the verb stem.

Examples
고양이 만지면 안 돼요.
You’re not supposed to touch the cat.
지금 가면 안 돼요.
You shouldn’t go now.
아직 먹으면 안 돼요. 아직 뜨거워요.
You should eat yet. It’s still hot.