to后面跟名词或代词，作其宾语时是介词。to后面跟动词原形时是动词不定式，to不能做连词。
详细解释：
to 英[tə] 美[tu,tə]
prep. 到; 向，朝着; 关于; 属于;
adv. 朝一个方向的; 到某种状态; 关闭;
[例句]Two friends and I drove to Florida during college spring break
我和两个朋友在大学春假期间开车去了佛罗里达。
to的用法：
一：表示相对，针对
be strange (common, new, familiar, peculiar, distinct, sensitive,immune, vulnerable, indispensable) to
Air is indispensable to life.
Aircrafts are vulnerable to interference caused by radiation.
This injection will make you immune to infection.
二：表示对比，比较
1：以-ior结尾的形容词，后接介词to表示比较，如：superior ,inferior,prior,senior,junior
The quarrel happened prior to my arrival.
2: 一些本身就含有比较或比拟意思的形容词，如equal，similar，equivalent，analogous
A is similar to B in many ways.
3：表示一些先后顺序的形容词，如：second,subsequent,next,preliminary,preparatory
Subsequent to the war,they returned to their hometown.
4: to也偶尔出现在个别动词之后,与动词形成固定词组,表示比较,如:prefer to,compare to,incontrast to
compare to sth.表示比喻或比拟,而compare with sth.表示比较,如:
World is usually compared to a stage
Compared with his past,he has changed a lot.
Prefer的正确句型是:prefer A to B或prefer doing A to doing B,但当prefer后接动词不定式时,表示比较的介
词to就要改成rather than ,如:
The undaunted soldier preferred death to surrender.
Many people prefer spending money to earning money.
They prefer to pursue careers rather than remain home as house wives.
5: to与及个别的名词构成比较之意,如:alternative
Going to an under water concert is a great alternative to going to dinner.
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 a bridge引桥
the approach to science
Half of the population was estimated to have no access to the health service.
The access to education 接受教育的机会
The access to medical care 享受公费医疗的权利
3: 表示人物职位和官衔的词,如:assistant to manager, ambassador to Spain, successor to tradition,heir to
throne,deputy to the National People’s Congress
advisor to the Prime Minister
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 todoor,invitation to
party,
guide to action,limitation to life,accessory to school
四: to还具有依据,伴随,和着节奏的含义,
如:sing to piano, chance to the tune, stamp to the rhythm of the song, add salt to taste
（一）：表示相关联，相连接，如：be related to,be relative to,in relation to,be relevant to,link to
Investigate all the facts related to the problem.
People often linked walth to happiness.
（二）：表示反对和赞同。
1：to引导的表示反对，抗拒，对抗意义的词组。Be opposed to,be oppsist to,be contrary to,beadverse to,be
resistant to,be contradictory to,object to,oppose to,deny tp,be aline to
These buildings are resistant to earthquake.
They are to tally opposed to any changes being made in the plans.
2: to引导的表示同意，赞同意义的词组：consent to,subseribe to,
The employer consented to give him a salary raise.
表示调整，使符合，使适应的含义，如：adapt to,commodate to, adjust to,conform to,habituateto,fit to,suit
to,correspond to,cater to
She tried to habituate herself to the style of plain living.
Your action should conform to the interests of the people.
They offered various foods to cater to the need of customers.
His words doesn’t fit to his actions.
Suit your writing style to the masses.
3: 表示投降,屈服,服从的含义,如:be subject to,be subordinate to,submit to,subject to,surrenderto,give in
to,confess to,admit to.
The minority is subordinate to the majority少数服从多数
Countries nearby oceans are always subject to earthquake.
He confessed to having robbed the woman of her wallet.
We’re not the kind of people to yield to any military threat.
五: 表示趋势或倾向,
如:tend to,be prone to,be inclined to,be apt to,be liable to
He’s liable to seasickness.
You are liable to come to wrong conclusion.
六: 表示对事情的坚持与执着,
如:sick to,hold o,adhere to,cling to
He still holds on to his original views.
七: 表示约束,局限,
如:limit to,confine to,resrict to
He’s confined to the house by illness.
He confined his remarks to scientific mangement.
八: 表示一种习惯或是一种适应性,
如:get (be) to,used to,be accustomed to
Finally,the students got used to my teaching method.
九: 表示起因和原由,
如wing to,due to,thanks to,attribute to,come down to
The flight was cancelled due to the thick fog.
The famous artist attributed his success to his wife.
