He could eat 10 bowls of rice every meal before.
意思：以前他每顿饭能吃10碗大米饭。
否定句：
He couldn't eat 10 bowls of rice every meal before.
一般疑问句 :
Could he eat 10 bowls of rice every meal before ?
就 划线部分eat 10 bowls of rice every meal 提问：
What could he do before ?
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