1. "Are you a doctor?", Nam asked me.
Nam asked me if I a doctor.
2. My mother bought me a present yesterday.
A present was bought for me by my mother yesterday.
3. They pass all the exams. They are lucky
They are lucky to pass all the exams.
4. I study English because I want to read books in English.
I study English so as to read books in English.
XIN CTLHN !