Ответ:
1 Jonathan stated that he believed in ghosts.
2 Theo observed that it was becoming warmer.
3 Jane said that she had worked in New York for three months.
4 Rosa complained that she had spent ages cleaning the oven.
5 The customers told the manager that they had been waiting for two hours.
6 Miss Chang noted that Tom had been late twice.
7 Greta said that they had cancelled the performance.
8 Joseph complained that his sandwich tasted strange.
9 The soldier informed me that his grandfather had fought in the war.
10 The judge solemnly told the man that his conduct had been unforgivable.
Объяснение:
Чтобы перевести прямую речь в косвенную, нам нужно как бы сделать шаг назад во времени. Так Present Simple превращается в Past Simple. Соответственно Present Continuous = Past Continuous, Present Perfect = Past Perfect.
Если же в прямой речи было прошедшее время Past Simple, то оно становится Past Perfect (см. 4, 9, 10)