I must read this book.
She must be reading this book.
Mother was ill, and I had to take my sister to school.
They must be playing in the yard.
I had to go to the chemist’s to buy medicines.
She must have gone to the chemist’s.
You must speak to her.
They must be speaking about it now.
I had to write to my sister about it.
She must have written to her sister.
He’s feeling really unfit. He must take more exercise.
You must be Ann’s friend.
The children aren’t home yet. — They must have been held up at school.
I had to solve my problems by myself.
We had to leave our home.
He must be joking!