I have to + (verb)
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The words 'have to' describe something that needs to take place soon. It expresses certainty, necessity, or obligation.
Here are some examples:
I have to switch schools.
I have to use the telephone.
I have to go to the bathroom.
I have to leave.
I have to unpack my bags.
You can also add the word 'don't' to suggest that someone is not required to do something.
I don't have to switch schools.
I don't have to use the telephone.
I don't have to go to the bathroom.
I don't have to leave.
I don't have to unpack my bags.