Find a mistake with have to, should or must in each sentence and correct it

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IV. Find a mistake with have to, should or must in each sentence and
correct it.
1. Under the new regulations, workers have to wear protective clothes.
2. When you come to Brazil, you should to tip the waiter 10% of the bill.
3. In Australia, you mustn't to comment on a person's accent.
4. In my family, children has to get permission before leaving the dining table.
5. When we were young, we have to stand in a row to greet guests.