Identify the past tense of 'buy' from the list in exercise 1.

The past tense of 'buy' from the list in exercise 1 is 'bought'.

• The list provides pairs like 'a made', 'b wrote', 'c drew', 'd bought', 'e ate', 'f gave', 'g drank', 'h sang', 'i left'.
• The word 'buy' corresponds to the past tense 'bought', which is paired with the letter 'd'.

Answer: bought