2．不定式的句法功能
除了谓语外，不定式可以担当句子的任何成分。
To see is to believe. 眼见为实。(作主语和表语)
You should continue to learn as long as you live.
要活到老学到老。(作宾语)
She usually has a lot of meetings to attend in the evenings. 她晚上经常有很多会要开。(作定语)
To do a good job, we must have the right tools.
