I couldn't swim very well when I was 5 years old - Lack of ability in the past, I had to practise how to write a lot when I was in first grade - obligation in the past, I didn't have to study for tests when I was in kinder - Lack of (no) obligation in the past, I can speak English now - Ability in the present, I can't dance very well - Lack of (no) ability in the present, My sister could sing beautifully when she was a little girl! - Ability in the past, We have to wear a blue uniform to come to this school - obligation in the present, My mom doesn't have to cook my lunch because I eat at achool - no obligation/necessity in the present,

Can/Could vs Have/ Had to and Didn't have to

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