1 a) HAS BEEN AGEING (How long)

1. b) HASN’T AGED (How much)

2 a) HAVE DRIVEN (How many times)

1. b) HAVE YOU BEEN DRIVING (We see result now – we want to know about the activity)

3 a) HAVE FORGOTTEN (Finished action)

1. b) HAS BEEN FORGETTING (Unfinished activity)

4 a) HAVE BEEN FLYING (How long)

1. b) HAVEN’T YOU FLOWN (Experience)