• Expressing ability, possibility and obligation
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  • When I finish the course next year I can speak perfect French.
    When I finish the course next year I WILL BE ABLE TO speak perfect French.
  • You’ll have to call a cab. I can’t have been able to drive since I broke my arm last June.
    You’ll have to call a cab. I HAVEN'T BEEN ABLE TO drive since I broke my arm last June.
  • This computer is so simple that it is able to be operated by anyone.
    This computer is so simple that it CAN BE operated by anyone.
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