1) Mike said he was sure Ann and Kate would be excellent guides.
2) He said they had made good progress in English.
3) Oleg said that one or two days later several English students would come to pay a visit to their university and he would probably have to act as an interpreter.
4) Ann said she had just met Boris in the street.
5) She said Boris had told her a lot of interesting things about his travels in the south.
6) Nick said he was going to the hotel to see his friends who had just arrived in St. Petersburg from the USA.
7) He said they hadn't been there for a long time.
8) He said they had been friends at school.
9) He said he would take them to the theatre on Sunday. 
10) They said they would write me a letter when they returned home.