Объяснение:
1.1. they want to study.
Do they want to study?
what do they want to do?
who wants to study?
do they want to study or play?
they want to study, don't they?
1.2 she likes swimming.
does she like swimming?
who likes swimming?
does she like swimming or singing?
she likes swimming, doesn't she?
2.1 they wanted to study.
did they want to study?
what did they want to do?
who wanted to study?
did they want to study or play?
they wanted to study, didn't they?
2.2 he went to school.
did he go to school?
where did he go?
who went to school?
did he go to school or to the store?
he went to school, didn't he?
