chúc học giỏi
1. I can't decide whether i should answer this letter
=> I can’t decide whether to answer this letter or not.
2. tell me how i can improve my pronounciation of English
=> Tell me how to improve my pronunciation of English.
3. he has no idea who he should call for help in case of imergency
=> He has no idea who to call for help in case of emergency.
4. he asked his father when he should leave for the bus tomorrow
=> He asked his father when to leave for the bus tomorrow.
5 she wondered how she can tell this new to her parents.
=> She wondered how to tell this new to her parents.
6. my mother couldn't decide how much money she should spend on Tet holiday
=> My mother couldn’t decide how much money to spend on Tet holiday.