1) He has already done his homework for half an hour, but he has not done half of it yet.
2) What were you doing when they called you yesterday?
3) Granny has cleaned the flat, before her children returned.
4) Jim had washed the dishes by 8 o'clock yesterday and at 8 walked with his dog.
5) Alice is sleeping still. She has already slept for two hours.
6) Mary wrote a letter at five o'clock yesterday.
7) Everybody was at the theatre, but my cousin hasn`t come yet.
8) While they watched a new TV show, they were eating popcorn and drinking lemonade.
9) If you want I wiil give you my bike tomorrow.
10) Your daughter has already returned from London?
11) Sophie skidded at seven o'clock yesterday.
12) When morning came, the storm has already stopped, but the snow is still falling.
13) Poly had returned from the cinema by 10 o'clock yesterday.
14) Stacy had learnt three poems by heart by 9 o'clock and at 10 she played chess.
15) Where are your gloves ? - I have put them into my bag.
16) Jane’s sister baked pancakes since 11 o'clock and she has already baked 20.
17) While Barbara skated, her friend has sledged.
18) If she had waited, mum would have bought her a new computer.
19) Have you met my friends recently?
20) We didn`t eat ice-cream at 12 o'clock yesterday.