to如果是不定式的话有一定的目的性，用to来引出动作，是非谓语的。而如果是介词，则是强调to前面的动词，to后面是对前面动词的补充，这时to作介词后面用动词ing形式。
大部分的to还是不定式的标志，只有少数的是介词，你可以重点记忆一些常见的如：
1. access to 接近,进入(某地的)方法; 通路
The only access to that building is along that muddy track.
到那栋建筑的唯一通路是沿着那条泥泞的路走。
2. according to 按照,依照,视……而定
The work was done according to his instructions.
那工作是依照他的指示做的。
3. be addicted to 沉溺于……,对……上瘾
He became addicted to the drug.
他上了毒瘾。
4. belong to 属于
This dictionary belongs to me.
这本词典是我的。
5. contribute to 为……做贡献,为……撰稿
Everyone should contribute what he or she can afford to society.
人人都应该尽自己的能力为社会做贡献。
6. devote to 献身，致力于……
He has devoted his life to helping disabled people.
他一生献身于帮助残疾人。
7. due to 因为,由于……而起
His lateness was due to the very heavy traffic on the motorway.
他迟到是因高速公路上车辆过多所致。
8. be equal to 与……相当,有能力胜任……的
Bill is quite equal to running the office.
比尔的能力足以管理这个部门。
9. get close to 靠近,接近
Today many people like to go out to get close to nature.
如今许多人喜欢到户外去接近大自然。
10. get down to 开始做某事,认真处理某事
It’s time I got down to some serious work.
我该认真干点正事了。
11. hold to 忠于……,坚持,遵循
Whatever your argument, I shall hold to my decision.
不管你怎样争辩,我将坚持我的决定。
12. help oneself to 自取,自用(食物,饮料等)
Help yourself to a cigarette.
请随便用香烟吧。
13. look forward to 盼望,期待
We are so much looking forward to seeing you again.
我们非常盼望再见到你。
14. lead to 导致
This misprint led to great confusion.
这个印刷错误造成很大的混淆。
15. prefer…to…两者间更喜欢……
I prefer walking to cycling.
我愿意步行,不愿意骑自行车。
16. pay attention to 注意
Pay attention to what the teacher is talking about!
注意老师说的话!
17. refer to 提到,涉及到,关系到,参考,查阅
What I have to say refers to all of you.
我要说的事和你们大家都有关。
18. relate to 与……有关,涉及……
Wealth is seldom related to happiness.
财富鲜于幸福有关。
19. see to 照看或处理某事物
Will you see to the arrangements for the next committee meeting?
你来处理下次委员会会议安排,好吗?
20.stick to 坚持,不改变或不放弃
We don’t want to hear your opinions; stick to the facts!
我们不想听你的想法,只讲事实!
21.turn to 转向,求助于,转而做
The more depressed he got, the more he turned to drink.
他情绪越低落越是借酒浇愁。
22.used to 习惯于……,适应……
She is quite used to working hard.
她很习惯做艰苦的工作。
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