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We use can and can’t to talk about present

abilities.
I can ride a bike.

Tom can play the piano.

My sister can’t drive a car.

Could & couldn’t are the past form of can and

can’t.

We use could and couldn’t to talk about

abilities in the past (when).

Subject + could/ couldn’t + verb (inf)

When I was six, I could run fast.

When I was younger, I couldn’t ride a bike.

When I was a baby, I couldn’t read.

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