6.has taken

7.have finished

8.have ....eaten

9.hasn't came

10.have worked

11.have you known

12.haven't done

13.have seen,has ....done

14.have gone

15.has been

16.hasn't had

17.hasn't played

18.haven't had

19.haven't seen

20.has lived

`text{6. has taken}`

`text{7. have finished}`

`text{8. have - eaten}`

`text{9. hasn't came}`

`text{10. have worked}`

`text{11. have you known}`

`text{12. haven't done}`

`text{13. have seen - has - done}`

`text{14. have gone}`

`text{15. has been}`

`text{16. hasn't had}`

`text{17. hasn't played}`

`text{18. haven't had}`

`text{19. haven't seen}`

`text{20. has lived}`

`text{công thức:}`

`text{(+) S + has/ have + V3/ed}`

`text{(-) S + hasn't/ haven't + V3/ed}`

`text{(?) has/ have + S + V3/ed}`