I ____ swim when I was 2 years old. I learnt to swim when I was 4. John ____ speak German when he was a primary school student. He learnt German in kindergarden. I ____ climb up trees when I was a kid. It was very hard for me. My mom ____ cook when she was a teenager but now she can. ____ you walk when you were 7 months old? Babies generally start to walk when they are one year old.

could / couldn't

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