Помогите пожалуйста! Задание 1. Write questions for these answers with How long and the present perfect
They've been in class for 15 minutes
He's known John since he was at primary school
Mary has worked in Miami since 2007
Pat and Ray have been married for one year
My mother has had a motorbike since last year
They've studied Chinese for two years

How long have they been in class?How long has he known John?How long has Mary worked in Miami?How long  Pat and Rat  have been married?How long has had your mothed a motorbike?How long have they studied in China?

5 Has my mother had a motorbike since last year?How long has my mother had a motorbike?6 Have they studied Chinese for two years?How long have they studied Chinese?