Помогитее Поставьте глагол в Present Perfect Continuous

1. James is in his room, he has been playing there since the morning.2. For 3 hours now we have been chatting about it and we haven’t come to any decision yet.3. Jane, do you know where my hat is? I have been looking for it for half an hour and I can’t find it.4. Your cousin has been dancing with that red-haired girl since she came into the room.5. He has been trying to solve this problem for several months now but he hasn’t found a solution yet.6. He has been teaching at school for twenty years.7. Mr. Smith has been working in his room since early morning. 8. The children have been sleeping for 5 hours.