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be able to,can be able to和can都可以表示“能”。表示现在或过去“能力所及”时,二者可互换使用。例如:We are able to/can speak English.我们会说英语。be able to可以有各种时态形式。例如:He will be able to finish reading the book next week.
Be able to, can be able to and can can represent “can”. When the current or past “Capability” is available, they can be used interchangeably. For example: We are able to/can speak English. We speak English. Be able to have a variety of tense forms. For example: He will be able to finish reading the book next week.