老师
Good morning. Today we will discover some useful structures in Unit 4. In this class, you will identify and understand the meanings and functions of infinitives used as attributes and adverbies. Describe space facts and efforts to explore space using infinitives as the attributes and the adverbial. First, please look at the following sentences, focus on the italicized infinitives and identify their functions. No. 1, I trained for a long time to fly airplanes as a fighter pilot, was the function of two.
学生
fly 为了更好地帮助大家理解 to fly 的语法功能，我们可以把这句话的后半句改写一下。根据句意可改为。
老师
i train for a long time in order that i could fly airplanes as a fighter pilot in order。
学生
that。引导的是目的状语从句。因此我们可知 to fly 做的是状语。
老师
2, as we all know, an astronaut needs to be healthy and calm in order to work in space. Like the first one, we can paraphrase the sentence like this. As we all know, an astronaut needs to be healthy and calm in order that he or she can work in space. In order to work can be changed into an