[观察例句]
观察黑体部分在句中的语法作用
1．To get there by bike will take us half an hour. 作主语
2．Her job is to take care of the children in the kindergarten.
作表语
3．To do this is to cut the foot to fit the shoe. 作主语
4．To have known you is a privilege. 作主语
5．The purpose of education is to develop a fine personality in children.
作表语
