UC知道this problem is still puzzling me 为什么is不换成别的动词作谓语
来源：百度知道 编辑：UC知道 时间：2024/09/21 06:51:10
be动词+现在分词表示进行时，意思是这个问题一直困扰着我。
现在进行时固定用法呗
一直困扰我。用is still puzzling, 或者has always been puzzling，多好呀。
puzzle是谓语，is是系动词
因为是现在进行时的固定用法：be+动词-ing
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