这里的不定式结构是形式主语 it 对应的逻辑主语,对这个问题回答一下就能看出了。 It is ... to work for a boss who is much younger than you. = To work for a boss who is much younger than you is ... 这里的 like 的确是介词,但它的宾语是因疑问而提前了的 what,而不是 to do。 句子意思是:为一个比你年轻得多的老板工作是什么感觉?
It is like ... to work for a boss who is much younger than you.
= To work for a boss who is much younger than you is like...
这里的It是形式主语,to work for a boss who is much younger than you 是动词不定式短语作真正主语(或叫做“真实主语”),不叫“逻辑主语”。这里的 like 是介词。