Please, check my for English tenses are correct

1.What has he been saying to you about me? (or myself?)
2.What is the matter with myt hat? Have you been sitting on it?
3.Who has been sitting on my bed? correct
4. Usually he was is sitting on the armchair. But today he hasd moved onto the sofa.
5. He told his brother what have he's been doing here.
6. What have you been doing here? - I was have been ironing a trousers. (or "...I have been ironing ..." ?) (here is not really wrong, but it is not needed)
7. He talked was able to sit the exam because he has had been preparing assidously. (or "... was preparing..." ?) It would be more natural to say diligently than assiduously
8. Your My eyes are red. - because I have been preparing for tomorrow's exam. (or "...I was preparing..." ?)
9. We were preparing studying in the library from three to five.
10. Why do are you yawning? - I have been sleeping. (or "...I was sleeping ..." ?)
11. He saw a legs. Somebody have been was sleeping on in his bed. (or "...Somebody was sleeping...")
12. The bed was in disorder. Somebody clearly had slept on in it already.
13. Somebody was reading my book. That is not my bookmark.