11. She asked Nam if/ whether his sister and brother went to the same school.
12. He asked Nam if/ whether he had finished his task.
13. The boy asked me if/ whether I could lend him ten pounds.
14. I asked John why he wasn't looking for a job.
15. His friend asked him how he went to the airport.
16. I asked him whose car he had borrowed the previous night/ the night before.