7. Use the verb in the Principle Clause in the Past Tense and make all the necessary changes:

A. 1. She says that she works five days a week. 2. I know they love classical music. 3. We believe that it is true. 4. I'm afraid I don't understand the problem. 5. The guide says there ; is a medieval castle on the top of the hill. 6. He says he can't speak French.

B. 1. We know that we are going to begin our work tomorrow. 2; I think it is beginning to rain. 3. She says she is washing _ti up and her sister is watching television. 4. They say it is snowing heavily and a strong wind is blowing. 5. He says they are going to Britain for summer holidays.

C. 1.1 think they have returned from the trip. 2. They say they have made and lot of pictures of New York. 3. We know you have travelled all over America. 4. She says she has made some interesting new friends. 5. He is sorry he hasn't been able to pass the exam. 6. I'm sure they have received our letter. 7. She doesn't remember how long they have been leaning .s English. 8. She says it has been raining ever since morning.

D. 1. He says he wrote the letter last week. 2. Mother says my brother returned an hour ago. 3. They say there were a lot of questions after the lecture. 4. I know he had an accident a couple of days ago. 5. I suppose I saw them at the theatre. 6, She writes that they visited Liverpool, the home town of the Beatles, last summer. 7. I'm sure you had a wonderful holiday in St. Petersburg. 8. The children say they had a very good time with their granny.

E. 1. I suppose my sister will meet me at the airport. 2. I'm afraid our plan won't work. 3. Mother says we shall have lunch in a few minutes. 4. The weather forecast says the weather will change for the better next week. 5. We hope we'll be able to , swim in the sea. 6. I'm sure you'll enjoy the party. 7. She says her brother will graduate in a year. 8. I suppose the work won't take us the whole day. 9. They don't know when they will return.

F. 1. The teacher says the students will be writing their paper for an hour and a half. 2.1 think I'll be looking through these papers after dinner tonight. 3. He says he'll be preparing for his report in the library. 4. I know you'll be watching television the whole evening. 5. I'm afraid they'll be quarrelling again. 6. I don't know what I'll be doing tonight. 7. We know they'll be waiting for us at the bus stop.

G. 1. She says she will have finished the translation by the evening. 2. Jane hopes her friend will have received her message by that time. 3. I'm sure the examination will have ended by 2 o'clock. 4. I promise we'll have cleaned the house by mother's return. 5. The repairmen say they'll have finished repairing the house by the end of the season. 6. The teacher says by the end of the year we'll have learned a lot.

H. 1. He says he will leave as soon as he gets the money. 2. I'm sure they'll come to the party if we invite them. 3. She says she'll go out only when she has done her homework. 4. Kate writes that she'll send us a card after she has had a sightseeing tour of London. 5. I'm afraid you'll not recognize me when we meet. 6. Mother says we'll go out to the country if it's not raining. 7.1 hope she will help me if I ask her. 8. She is afraid she won't be able to marry him before he has found a good hours.