The poor boy had difficulty walking为什么前面用过去式后面的walk用现在进行时呢?

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The poor boy had difficulty walking为什么前面用过去式后面的walk用现在进行时呢?
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The poor boy had difficulty walking为什么前面用过去式后面的walk用现在进行时呢?
The poor boy had difficulty walking为什么前面用过去式后面的walk用现在进行时呢?

The poor boy had difficulty walking为什么前面用过去式后面的walk用现在进行时呢?
walking是动名词用作名词