to get 不定式通常被认为是做状语.而且这里属于不定式的主动表被动用法.是高中阶段一个重要的语法现象：be+adj+to do.如果不定式的动词是不及物动词,须加相应的介词.常用的形容词有：hard/ difficult/pleasant/important/safe/cheap/expensive等.
如：The girl is hard to get along with.
The English is hard to learn.
The car is expensive to buy.