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1)haven't;went;has she done;studied;did she like;did
<span>My cousin (is washing) up at present.</span>
She must do her homework.
They must visit their grandmother.
I must help my Mum.
We must cook a cake.
He must bye a car.
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I mustn't go to walk with my dog.
They mustn't eat meat.
She mustn't live without their parents.
John mustn't sleep so late.
I mustn't stay at home one.