介词The shuttle will remain for a week and a half to complete work on a Japanese space laboratory
问题描述：
介词The shuttle will remain for a week and a half to complete work on a Japanese space laboratory
The shuttle will remain for a week and a half to complete work on a Japanese space laboratory to 这里
答
The shuttle 才是主语,will remain 是谓语,for a week and half 是介词短语起状语作用,表达remain 的时间长短,to complete work 是动词不定式短语,作为目的状语,表达 remain 的目的,介词 on 带的介词短语,作为动词不定式短语的状语,表达 to complete work 的地点.因此,to 这里并不是也不可能成为主语.