tolong saya gak bisa ngerjain soalnya.susah banget

1. will
2. would have
3. studied
4. i don't have a plane so i cannot travel around the world.
5. would
6. had found
7. you weren't lucky so you didn't get a free ticket to singapore.
8. we aren't late so we can enter the classroom.
9. i didn't know how to swim so i couldn't help you.
10. have
11. my father asked my brother if they had eaten out together the previous day.
12. aurelia asked fino where she could buy that hat then.
13. he told me not to turn off the light then.
14. he said that he began to understand the concept of biodiversity.
15. he says that he is ill.