原形是 be able to是能够的意思
这里的be able to是有能力做某件事情的意思,它相当于一个情态动词,情态动词＋do原形．所以be able to＋do的原形形式
你问的was able to只不过是过去时态里,后面依旧是动词原形.
was able to 怎么搭配?
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