I think doing more exercises is a good sport for students.请问,谁能告诉我be动词为什么用is,急

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Ithinkdoingmoreexercisesisagoodsportforstudents.请问,谁能告诉我be动词为什么用is,急Ithinkdoingmoreexercisesisagoods

I think doing more exercises is a good sport for students.请问,谁能告诉我be动词为什么用is,急
I think doing more exercises is a good sport for students.请问,谁能告诉我be动词为什么用is,急

I think doing more exercises is a good sport for students.请问,谁能告诉我be动词为什么用is,急
宾语从句(Doing more exercises 主语)(is a good sport for students系表结构).
单个非谓语动词(限于动名词和动词不定式)作主语时,谓语动词用单数.这是语法规则.再如
To look after these students is my duty this afternoon.(照看好这些学生是我今天下午的工作.)

doing more exercises 作为动名词短语作主语为单数 所以才用is 若主语有两个动名词短语作主语就是用are

这里用is是把前面doing more exercises看做是一件事情 明白吗 所以是单数

think后是一个宾语从句,doing more exercises是这个句子的主语,is是谓语,动名词作主语,当单数看待

动名词作主语谓语动词用is