Answer:
1. "I have cleaned the room", he said.
→ He said that he had cleaned the room.
2. Sam is sick, so she can't come to the party tonight.
→ If Sam was sick then he couldn't came to the party tonight.
3. Because it was raining, we didn't go camping
→ Because of rain we does not go camping.
4. Despite playing very well, they didn't win the tournament.
► Although they were playing very well they doesnot won the game.
Explanation:
not too much sure