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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