English sentences containing noun clauses.

1. What Kahfi did shocked his friends. 
2. Kahfi's friends didn’t know that he couldn’t swim.
3. Kahfi's mistake was that he refused to take lessons.
4. Mary is not responsible for what Kahfi did.
5. Everybody is sad that Kahfi drowned.
6. I know that Kahfi made a mistake.
7. Where Kahfi did spooked his girl friend. 
8. I know that the students studied their assignment.
9. I wonder what is making Tracy so unhappy.
10. I dont know where Kahfi is