Ex 2 Correct the mistakes if any. 1)They are discussing the problem for hours, but has not solved it yet.
2)Somebody has been playing tennis since 2 o'clock.
3)Is it still raining? No, it have stopped.
4)John has been winning the championship two times.
5)The boys have fished for 3 hours.
6)How many books have you written?
7)Mike has invited many friends to his birthday party.
,очень )