Explanation:

- Option 1: since he was eight

- This phrase is correct. It indicates the time from when he started playing tennis.

- Option 2: he had being

- This is incorrect. It should be "he had been." "Had been" is the correct past perfect tense for actions that started in the past and continued up to another past time.

- Correct Answer: Option 2 - he had being

- Option 3: He said

- This phrase is grammatically correct. It introduces reported speech.

- Option 4: playing tennis

- This is correct. It follows the structure of the verb phrase.