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1. Perhaps the best way to understand Western art is to look at the development of Western painting over the centuries.
2.During the Middle Ages, the purpose of Western art was to teach people about Christianity.
3. In this work, Monet's aim was to convey the light and movement in the scene
1 结构
am/is/are/was/were + 不定式
The purpose of education is to develop a fine personality in children.
教育的目的是发展儿童良好的品格。
2 功能
（1）表示目的
The next step is to understand exactly what conveys in the contemporary painting.
下一步要弄清楚这幅当代画所表达的确切内涵。［词汇复现］
（2）表示事态发展的结果、预期的结果及预言
You must speak out，if we are to remain friends. 如果我们还想继续做朋友的话，你就必须把话都说出来。
We believe man is to live a better life in the future. 我们相信人类在将来会生活得更好。
（3）用于第一人称疑问句，表示征求意见
What am I to do if I can’t gain entry to the final? 如果不能进入决赛，我该怎么办呢？［词汇复现］
（4）用于被动语态，相当于should，具有情态意义
These books of great value are not to be sold. 这些书很有价值，不应该卖掉。［词汇复现］
（5）表示“安排、命令、决定、劝告、意愿、禁止”等
I am to set out for China next week. 下周我要动身到中国去。（安排）
You are to have a face-to-face talk with them. 你应该和他们当面谈一谈。（劝告）
Children are not to smoke. 儿童不准吸烟。（禁止）
