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怎么用be able to造一句英语句子

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怎么用be able to造一句英语句子
2)只用be able to a. 位于助动词后. b. 情态动词后. c. 表示过去某时刻动作时. d. 用于句首表示条件. e. 表示成功地做了某事时,只能用was/were able to, 不能用could. He was able to flee Europe before the war broke out. = He managed to flee Europe before the war broke out. I didn't manage to do it until you had explained how. 直到你教我后,我才会做.