It’s not easy being your age,and it’s normal to have these feelings.这个句子的be动词为什么要加ing?

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It’s not easy being your age,and it’s normal to have these feelings.这个句子的be动词为什么要加ing?

It’s not easy being your age,and it’s normal to have these feelings.这个句子的be动词为什么要加ing?
It’s not easy being your age,and it’s normal to have these feelings.这个句子的be动词为什么要加ing?

It’s not easy being your age,and it’s normal to have these feelings.这个句子的be动词为什么要加ing?
这里有这样的语法点:动名词做主语+it 形式主语.句子本来是Being your age is not easy.(Being是be动词be的动名词形式)为了避免头重脚轻,用it做形式主语,真正的主语被放到了后面.

be是个动词。不加ing
的话就有两个谓语(动词)所以加ing