1. He is strict but kind.
- He isn't strict but kind.
- Is he strict but kind?
2. We are late today.
- We are not late today.
- Are we late today?
3. The children can sing english songs well.
- The children can not sing English songs well
- Do the children sing english songs well?
4 .Mr.Nam can help us
- Mr.Nam can not hlep us.
- Could Mr.NAm help us
5.I walk to work every day.
- I don't walk to work every day.
- Do I walk to work every day?