5 a) In pairs, ask each other 8 questions as in exercise 4 and write the answers, as in the example. Had you learnt how to write by the time you were 6? – Yes, I had./No, I hadn't.

Explanation:

This is an instruction for a pair activity. The example shows how to form a question using the past perfect tense ('Had you learnt...') and provide a short answer ('Yes, I had.' or 'No, I hadn't.'). The task is to create 8 similar questions and answers based on a previous exercise (exercise 4), which is not provided here. Therefore, I cannot generate specific questions and answers.