disagree. sometimes only one variant is possible.
model. i saw somebody at the front door. i saw nobody at the front door. i didn't see anybody at the door.
1. there are some apples on the table. 2. yesterday i saw some thing interesting in the forest. 3. somebody has torn my bag. 4. ann knows some italian songs. 5. mum bought something tasty. 6. they celebrate some holidays. 7. the boy has found something under the christmas tree. 8. somebody was crying behind the door.​