помогите перевести подалуйста 1.You have to/may be over 10 years old

Помогите перевести подалуйста 1.You have to/may be over 10 years old to stay at home alone.2. You mustn't/don't have to open the door for a stranger3.A stranger may/should trick you.4.You mustn'/may tell anyone that you are at home alone 5.You must/might be sure you know your parents' phone number.6. It must/have to be useful to know people around you