Помогите пожалуйста! 10 предложений с complex object, заранее спасибо)

1. We saw a young girl leave the house.2. He thinks that problem to be unimportent.3. I hate you to sing this song.4. The professor declared the question to be of great importance.5. I noticed the children enter the shop.6.We noticed the woman enter the house through the back doorю 7.I saw them walk along the road. 8.I did not hear her say this because she spoke in a soft voice.9.I have never heard you sing. 10.We saw the postman slip a thick envelope into the box.