Ответ:

1. Правильно

2. Sara said she wasn’t enjoying the trip to the desert region

3. Ben and Julia said that they had learned...

4. Правильно

5. Правильно

6. He said that they we had helped me...

Ответ:

1) Правильно

2) Sara said that she wasn't enjoying the trip to the desert region.

3) Ben and Julia said that they had learned a lot about the peace campaign.

4) Правильно

5) Правильно

6) He said that we had helped him a lot with the charity work.