Answer :
1. The man is unknown to me.
2. He was not absent in the class.
3. You will lose the game.
4. He does not understand me.
5. The nurse is not careless to her patients.
6. Let the door remain closed.
7. Nothing except fire causes smoke.
8. We have not seen the Taj Mahal before this.
9. We are sometimes not clever.
10. He is not hopeless.
[tex][/tex]