You can/can't ~
~해, 해도 돼
Can I tell you? 너한테 말해도 되는 걸까?
You can tell me. 저한테 얘기해도 돼요.
You can have it. 가져도 돼요.
You can use it. 그거 써도 돼요.
You can wear that. 그거 입어도 돼요.
~하면 안돼
You cannot~ (You can't~) ~하면 안 돼
You can't tell~ ~한테 말하면 안 돼
You can't use that. 그거 쓰면 안 돼
You can't go out. 외출하면 안 돼.
You can't go yet. 아직 가면 안되죠.