The key to exercise solutions in chapter 5 - Grammar for the textbook New Headway Elementary - Workbook with authors Liz Soars, John Soars and Jo McCaul from Oxford University Press
Question
Complete the sentences with could or couldn't.
Answer
I could walk when I was one, but I couldn't talk until I was three.
Could you read when you were five?
My daughter couldn't feed herself until she was four.
I couldn't sleep last night. My neighbour's TV was so loud!
I couldn't find you yesterday. Where were you?
'When I was five I could speak English and Russian.' 'Could you read English and Russian as well?'