8b
Grammar: must (have/has to)
We use must and have/has to, to say that something is necessary.
You’ll have to leave college soon.
You must think about your future.
We're very busy at the office. I have to work on Saturday morning.
Mark has to get the car repaired. There's something wrong with the brakes.
For negatives and questions with have /has to and had to, we use do.
I don't have to work on Sundays. Why does Andrew have to
study every evening?
Did you have to pay for your second cup of coffee? - No, I didn't. “I don't have to work”, means that it is not necessary for me to work.
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