johnny,you mustn't play with the knife;you may hurt yourself.

johnny,you mustn't play with the knife;you may hurt yourself.
johnny,you mustn't play with the knife;you may hurt yourself.

johnny,you mustn't play with the knife;you may hurt yourself.
小家伙,你不应该玩小刀,你可能会伤到你自己的.

Johnny,你不能玩刀子；否则你会伤着自己的。