She thinks taking a bus to school is cheaper为什么She不是主语,taking是主语?

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Shethinkstakingabustoschoolischeaper为什么She不是主语,taking是主语?Shethinkstakingabustoschoolischeaper为什么She不

She thinks taking a bus to school is cheaper为什么She不是主语,taking是主语?
She thinks taking a bus to school is cheaper为什么She不是主语,taking是主语?

She thinks taking a bus to school is cheaper为什么She不是主语,taking是主语?
这是个主从句结构,嵌套了一个由thinks为谓语动词的宾语从句,主句是 she thinks ,从句是(that)taking a bus to school is cheaper.主句中主语是she,从句中主语是 taking a bus to school.