1) I (look) for my keys since we came home. Where are they?! looking have looked been 2) She (make) puddings all day. has making have been 3) What (you / do)? You are so dirty! been have you doing 4) John (not / do) his maths homework for a long time. not has been doing 5) We (repair) cars since 2 pm and we haven't finished yet. repaired have repairing been 6) How long (he / teach)? he been teaching has 7) I (not / write) letters since my brothers came home. haven't writing written been 8) - Why are you crying? - I (watch) a sad film. 9) She (pick) strawberries since 10 am. 10) How long (you / play) volleyball? 11) Tom (not / run) long and he isn't tired yet. 12) I (clean) windows since lunch time. It's so exhausting.