more than one example is necessary to make the students understand this rule clearly 主语是? 谓语动词是is么? 后面是什么结构to在这里是介词么 表什么?

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more than one example is necessary to make the students understand this rule clearly
主语是?
谓语动词是is么? 后面是什么结构
to在这里是介词么 表什么?

主语是more than one example
is后是形容词necessary,后面是不定式结构
to是不定式结构,用来解释necessary