thì HTĐ 

S + vs/es

1 they don't have to learn new words

do they have to learn new words

thì QKĐ 

2 he didn't have to clean the floor yesterday 

did he have to clean the floor yesterday 

thì HTHT 

-> S + have / has + VPII 

-> homework ko đếm đc nên đi với much

3 they haven't got much homework

have they got much homework

thì HTĐ

4 mrs lan doesn't have to cook meals for the children 

does mrs lan  have to cook meals for the children 

thì HTHT + since 

-> s + have / has + VPII + since + 1 mốc thời gian

5 i haven't played piano since 6 o clock

have i played piano since 6 o clock 

6 nga doesn't have to writte letter to her mum

does nga have to writte letter to her mum

7 they have their mom doesn't make them drink

do they have their mom make them drink