Complete sentences by reporting the questions. 1 ‘How long have you known Mr Forbes?’
2 ‘When did you last see him?’
3 ‘Is he in trouble?’
The detectives asked me 1
Mr Forbes, and 2
So I asked them 3

1 The detectives asked me how long I had known Mr Forbes.
To report the question, we need to change the word order and use the reporting verb "asked." We also need to change the pronoun "you" to "me" to reflect the perspective of the speaker.

2 The detectives asked me when I had last seen him.
Again, we need to change the word order and use the reporting verb "asked." The pronoun "you" should be changed to "me" to match the speaker's perspective.

3 The detectives asked me if he was in trouble.
To report the question, we need to change the word order and use the reporting verb "asked." The pronoun "he" is changed to "him" to reflect the correct grammatical form. The word "is" is changed to "was" to match the past tense of the reported speech.

So I asked them those questions.
To report the statement, we use the reporting verb "asked" and change the word order to match a statement. We also need to include a pronoun "them" to indicate who was being asked the questions.