for的用法

各位老师好，请教一下下面这个句子里for highly skilled people to go on working well into what was once thought to be old age.是做什么成分的？谢谢老师。

At 83, he also epitomises a striking demographic trend: for highly skilled people to go on working well into what was once thought to be old age.

for highly skilled people to go on working well into what was once thought to be old age，是“不定式复合结构”。语法作用是trend 的定语，加了冒号后，在语义上它与trend 是同位关系。

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曹荣禄 1秒前

擅长：动词用法,句法问题

不定式复合结构作trend的同位语。定语和被修饰名词之间是不可能用冒号的。非限制性同位语通常由逗号、冒号或波折号引出。