TENDENCY: Teenagers can be quite moody sometimes., When I was younger, my brother could be very stubborn., REQUEST: Can you help me with this exercise, please?, Could you open the window, please?, ABILITY: She can speak three languages fluently., When I was a child, I could run very fast., POSSIBILITY/IMPOSSIBILITY: It can get really cold here in winter., It could rain later, so take an umbrella., PROHIBITION: You can’t park here — it’s a no-parking zone., When I was at school, we couldn’t use our phones in class., DEDUCTION: That can’t be her — she’s on vacation!, He could be the one who took your pen; he was sitting right here.,

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