to use them

1.作主语 如：①To see is to believe. 看了才会相信。
②it作形式主语，动词不定式做真正主语。
It's polite to use a large spoonand a fork to eat in Thailand.
在泰国用大汤勺和叉吃饭是非常礼貌的。
2.作表语：I think the most exciting way to sell flowers inthe evening.我认为傍晚卖花是最激动人心的事。
3.作宾语：I want to make a room reservation.我想预定一间房。
4.做宾语补足语：Miss wang asked Kangkang to book the ticket.
王老师让康康订票。
5.作定语：The best way to travel is by train.旅行的最好方式是坐火车。
6.作状语：Let's work in groups to find out the inforation about the cost.让我们分小组查明有关价格的信息。