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2) My brother had to do his homework because he was the teacher's pet.

Или

My brother didn't have to do his homework because he was the teacher's pet.

Тут непонятно, делал домашку, потому что был любимчиком у учителя, или не делал по этой причине)

3) In the past, children had to obey their parents.

4) Did you have to pay for your ticket?

5) It rained all day on Sunday. I was really glad that I didn't have to go to school.

6) A hundred years ago, people didn't have washing machines, so they had to do all the washing by hand.

7) Because of the snow last winter a lot of people had to spend the night in their cars.

8) When we went to Spain last year, we didn't have to speak Spanish, because a lot of people could speak English.

9) Did you have to ask the permission from your dad when you were ten?