I have to much homework to do不加to，题哦

一：表示相对，针对Air is indispensable to life.

二：表示对比，比较

The quarrel happened prior to my arrival.

三: 表示修饰关系

1: 表示回复,反应意思的词,如:answer to question,

solution to problem,response to inquiry,reaction to proposal,reply to letter

2: 表示建筑构件的词汇,如: entry,entrance,approach,access,passage,exit,vent,path

the approach to science

4: 表示权利和许可的词汇,如:right,admission

The employee finally got the admission to the boardroom.

Everyone has an equal right to ……..

5: 表示栅栏或障碍的词汇,如:bars to development,the barrier to progress

6: 表示与书籍,文本相关的词,如:introduction to passage.

7: 表示恭喜或是祝贺,如:

The director proposed a toast to the health of the guests.

Let’s drink to Dick’s success in business

8: 另外还有一些名词符合这种用法,有的具有两者息息相关,缺一不可的含义.如:key to door,invitation to

party,

guide to action,limitation to life,accessory to school