If you keep on working hard at English,you will pass the exam next time.为什么work后面要加ing

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If you keep on working hard at English,you will pass the exam next time.为什么work后面要加ing
If you keep on working hard at English,you will pass the exam next time.为什么work后面要加ing

If you keep on working hard at English,you will pass the exam next time.为什么work后面要加ing
可以记固定搭配 keep on + doing sth..
也可以记 介词后面加动词的ing分词形式.