MAY - To ask for permission, although "__________" is considered more formal., HAVE TO - To talk about obligation, things that are necessary to do, SHOULD - To give recommendation or even an opinion also to express something that is probable., MUST - It is common on public signs and notices informing people of rules and laws., CAN - To express ability or opportunity, to request or offer permission, and to show possibility or impossibility., OUGHT TO - Expresses weaker obligation or advice. It can be considered to not be as strong as must.,

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