hello please help im very confused

Answer:
1. si, le escribi
2. Si, te dije la verdad
3. Si los escribio juan
4. Si me compro un regalo
5. Si los explico
6. Si te las mande
7. Si se los compre
8. I don't know
9. Si te compre el libro
10. Si mi escribio paco
Explanation:
These should be all right i couldn't figure out how to say 8 the grammar confused me a little hope it helps