English tenses 9

Correct the mistakes if any.

They are discussing the problem for hours, but has not solved it yet.

Somebody has been playing tennis since 2 o’clock.

Is it still raining? No, it have stopped.

John has been winning the championship two times.

The boys have fished for 3 hours.

How many books have you written?

Mike has invited many friends to his birthday party.

He has been hating oranges since his childhood.

They have been taken the dog for a walk.

Irene has left for the airport.