42. Learning Chinese is more difficult than learning English.
=>Learning English is not as difficult as learning Chinese.
43. "Shall we go for a walk tomorrow?" said Peter.
=>Peter suggested going for a walk the next day.
44. People say that they bought this shop last year.
=>They are said to have bought this shop last year.
45. They can't go to work today because they are ill.
=>If they weren't ill, they would go to work today.
Q2 : 
46. He enjoys practicing speaking English with foreign people. (INTERESTED)
=>He is interested in practicing speaking English with foreign people.
47. The heavy fog prevented us from driving to work in time. (IMPOSSIBLE)
=>The heavy fog made it impossible for us to drive to work on time.
48. It was easy for us to get tickets for the concert.
=>We had no difficulty getting tickets for the concert.
49. She was reading a magazine in the doctor's office when I came. (LOOKING)
=>She was looking at a magazine in the doctor's office when I came
. 50. Could you ask Tom to give me back the novel? (MIND
)=> Do you mind asking Tom to give me back the novel?