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The tools were used to shake the leaves off the trees,so tha

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The tools were used to shake the leaves off the trees,so that we could find olive fruit easily
上面句子so that后面为什么用could,不可以用found么?
The tools were used to shake the leaves off the trees,so tha
could find表示能够找到,直接用found表示后面就找到了的事实.so that这个短语一般表达的是一种目的性,对于是否做到了不是特别强调,所以用could find比较好.如果不是用so that,用therefore、hence这样的连词,用found就更自然一些,表示一个事实和结果.