2. 1.couldn't 2. could. 3. couldn't 4. could. 5. couldn't 6. could.
3. 1. Could you play chess when you were ten years old?
2. Could you ride a bike when you were six years old?
3. Could you send a text message when you were two years old?
4. Could you swim when you were eight years old?
5. Could you speak English when you left primary school?