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Ответ:

6 Boris said that he went to the south every year.

7 He said that he was going to a health resort the next day.

8 Ann told us they hadn't come yet.

9 She told us they had arrived in St. Petersburg the day before.

10 I said I had been in London the previous year and my friend from London sometimes invited me to spend my holidays with him.

11 Nick said he had never been to London and he added he thought he would go there the next year.

12 He said he wouldn't stay with his friends too long.

Объяснение:

при изменении предложения в косвенную речь не забываем менять глагол, местоимение, обстоятельство времени:

6,10 предложение Present Simple на Past Simple

7 предложение Present Continuous на Past Continuous

8,11 предложение Present Perfect на Past Perfect

9,10  предложение Past Simple на Past Perfect

11,12 Future Simple на Future in the Past (would)