Have to is also a modal verb, though unlike the others, we must conjugate it in whatever tense you intend to use.
It indicates an obligation to do something, if used in the affirmative. So:
- Amber has to play the guitar every day. = Amber must play the guitar every day.
However, in the negative, it indicates a lack of obligation:
- Amber doesn’t have to do the laundry at home, her mom takes care of it. = Amber doesn’t need to do the laundry.
This rule is opposed to « must » which, in the negative, indicates that something is not allowed. For example, if someone says, « You mustn’t run by the poolside. » This means that you’re not allowed to run by the poolside.
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