Ответ:
1. He asked who that man is and added that he didn't know him.
2. I thought that he was a clever man and he could help me.
3. My brother said that in two hours he would have finished his work and then he would have go to the cinema.
4. The teacher told us to open our books and begin reading the new text.
5. The girl asked what was the price of that dress.
6. I told my father that I need help with that problem and that I could not solve it.
7. He said that we had forgotten to take the ball.
8. She said that she should have been very glad to see me.
9. Walter proposed to go to the Philharmonic, and added that there was a good concert that night. Robert agreed and added that he hadn't been to the Philharmonic for a long time.
10. Alec asked me if I had ever been to the National Gallery. I answered that I had visited it a year before when we were staying in London.
11. Kate proposed to go to Finland for the winter holidays, but Andrew refused, as far as they had already been to Finland. Andrew proposed Kate to go to Greece, and added that Greece would be very interesting country to visit and they had read about Greece a lot. Kate agreed.
12. Nellie said that a day before she had gone to see Paul, but he hadn't been at home. Nick proposed to see him that day at Paul's home. Neille refused, because she had been very busy that day.
Объяснение:
Direct speech is for quoting the exact words spoken.
Indirect (reported) speech is for reporting the words spoken.