CAN, COULD and BE ABLE TO - Part One

source: Simple English Videos   2017年7月14日
We've had requests for a video on the English modal verbs 'can' and 'could', along with questions about 'be able to'. So we're tackling them step by step, with lots of examples along the way. There's a lot of grammar to cover here so this video has two parts.
Part Two:
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