Explain the difference in meaning between the sentences. 1. a. Have you read Oliver Twist. b. Have you been reading Oliver Twist?2. a. We arrived at the hotel early in the morning. b. We had arrived at the hotel before the demonstration began. 3. a. Maria went out when George rang up. b. Maria had gone out when George rang up. c. Maria was going out when George rang up. 4. a. I had read the report before I went to bed. b. I had been reading the report for an hour when she came back from the theatre. 5. a. This time next summer we will be taking our entrance exams. b. By next July we will have passed our entrance exams. ​