be able to do能不能做谓语? 还是able to do是表语啊?

be able to do能不能做谓语? 还是able to do是表语啊?be able to do能不能做谓语? 还是able to do是表语啊?be able to do能不能做谓语? 还是able to do是表语啊?谢谢大家

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我错了...字典上写be albe tov.如果是这样的话，应该是be able to是谓语