⦁ It’s a long time since/ for I have seen/ saw/ have been seeing your brother Paul. ⦁ He has been/ was/ has been being

1) It’s a long time since I saw your brother Paul. 2) He has been strange ever since he had the accident. 3) He has lived in this town since 1980. 4) Sue has been listening to music since she bought a CD player. 5) You look very guilty! What have you done? 6) How many books have you collected for a year?