1) I will use this room tomorrow.
⇒ This room will be used tomorrow.
2) They bought this car yesterday.
⇒ This car was bought by them yesterday.
3) My father likes to do gardening at the weekend.
⇒ My father enjoys gardening at the weekend.
4) My father likes to do gardening at the weekend.
⇒ He is interested in the book.
5) His hobby is collecting stamps.
⇒ He likes collecting stamps.
6) She was sick but she went to school on time.
⇒ Although she was sick, she went to school on time.
7) They often played games when they were young.
⇒ They used to play games when they were young.