3.You have tea for breakfast, ? A. didnt you B. havent you C. dont you D. wont you 4.You dont know where she is, ? A. dont you B. do you C. isnt she D. is she 5.You are not tired, ? A.do you B. don't you C. aren't you D. are you 6.These books arent yours, ? A. are these B. arent these C. are they D. arent they 7.John has worked very hard, ? A. does he B. did he C. has he D. hasnt he 8.You arent too busy to talk with us, ? A. are you B. have you C. arent you D. havent you

`3.` `C`

`->` Tag questions : S + V + O, Aux(not) + S.

`->` Have (khẳng định) `=>` HTT `->` Aux HTT (`-`) : Don't/doesn't

`->` I/we/you/they +   don'

`4.` `B`

`->` Tag questions : S + Aux(not) + V, Aux + S.
`->` Don't (phủ định) `=>` HTT `->` Aux HTT (`+`) : Do/does
`->` I/we/you/they +   do.

`5.` `D`

`->` Tag questions : S + tobe(not) + O, tobe + S?

`->` Aren't (phủ định)  `=>` HTT `->` Aux HTT (`+`) : Are/is/am

`->` They/you/we  +  are.

`6.` `C`

`->` Tag questions : S + tobe(not) + O, tobe + S?

`->` Aren't (phủ định)  `=>` HTT `->` Aux HTT (`+`) : Are/is/am

`->` They/you/we/ N số nhiều  +  are.

`7.` `D`

`->` Tag questions : S + have/has + P2, haven't/hasn't + S?

`->` Has worked (khẳng định) `=>` HTHT `->` Aux HTHT : haven't/hasn't

`->` She/he/it/ N số ít  + Hasn't

`8.` `A`

`->` Tag questions : S + tobe(not) + O, tobe + S?
`->` Aren't (phủ định)  `=>` HTT `->` Aux HTT (`+`) : Are/is/am
`->` They/you/we  +  are.