there is a boy singing in the park 为什么sing要ingthere is a boy singing in the park 为什么sing要ing

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thereisaboysinginginthepark为什么sing要ingthereisaboysinginginthepark为什么sing要ingthereisaboysinginginthep

there is a boy singing in the park 为什么sing要ingthere is a boy singing in the park 为什么sing要ing
there is a boy singing in the park 为什么sing要ing
there is a boy singing in the park 为什么sing要ing

there is a boy singing in the park 为什么sing要ingthere is a boy singing in the park 为什么sing要ing
在同一句话中,前面已有动词is,其后的非谓语动词sing常+ing,或+to+动词原形(不能直接用原形)
而本句中,表正在唱歌,所以+ing,不能用+to+动词原形

there be + 名词 + 动词的ing
有做某事的......,表示主动。
老师祝你学习进步!
望采纳,多谢你的问题!^_^

you are a dog ... pig ... and die pig