Chuyển sang câu dưới dạng thì hiện tại hoàn thành

Giúp mk vs ạ
I.Hiện tại hoàn thành: S +have/has+ V-ed/3 +0>S+ have/has+been+ V-ed/3 + by O

6. They have built up some ideas in their mind.->Some ideas
7. Someone has stolen my bike.-> My bike...........
8. Someone has taken away all of my English books->All of my English books...
9. She hasn't done her homework yet.-> Her homework........
10. We have asked some friends of hers to join us.->Some friends of hers....