it must be terrible to be grown up
to be grown up不定式短语做真正的主语
it代替真正的主语是 形式主语
同时你可以这么说to be grown up is terrible只不过不这么说罢了
为了避免句子的头重脚轻
it must be terrible to be grown up中to be 是个什么成分啊?
3个回答
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