Question

Agora substitua must por have to
They must go to bed early
She must buy another computer
I must go now
You must be careful

Answer 1

They have to go to bed early 
She has to buy another computer 
I have to go now 
You have to be careful

Answer 2

they have to go to bed early
age have to buy another computet
i have to go now
you have to be caredul