1. [ have been playing ] .... [ did not ]
2. [ have known ] ..... [ met ]
3. [ didn't come ] ..... [ have you been sitting ]
4. [ have been working ] .... [ haven't had ]
(haven't had lunch implică faptul că tatăl nu luat prânzul incă, dar poate să îl mai ia, dar didn't have lunch înseamnă că nu a luat prânzul, iar acum e prea târziu și nu îl mai poate lua.
5. [ have you ever visited ] ..... [ went ]
6. [ have you and Mary been going out ] .... [ have you met ]
