如果to是介词,后面接名词,动名词,代词等(不可以接动词原形),如果to是不定式,后面只能接动词原形。
判断to是不是介词的诀窍
从语法上说,如果to后面可以跟名词,那么to一定是介词。
从意思上说,to作介词,常见的含义有:
1. [表示方向等,与 from 相反]向,往,到:
turn to the right
向右转
2. [表示时间的限度]直至;到…为止; 在…之前:
to this day
直到今天
3. [表示程度、情况、数量的限度]及于;至;达到:
wet to the skin
浑身湿透
4. [表示目的、意愿]为了:
to come to dinner
来吃饭
5. [表示结果]致,致使;被…弄得…;…的是:
sentenced to ten years in prison
被判处十年徒刑
6. [表示比较]比,比较,相比:
inferior to last year's crop
比去年的收成低
7. 倾向;趋向于(某一状况等):
to grow to manhood
长大成人
8. [表示相对位置]对;面对;对立;到…上;接近:
parallel to the roof
与屋顶平行
9. 给,予:
Listen to her.
听她说。
Give the dictionary to him.
把字典给他。
10. [表示归属]属于;…的:
the key to the classroom
教室的钥匙
11. 关于;就…而言;对于;依…看:
That's all there is to it.
那就是有关这一点的一切;如此而已。
to作为介词使用的固定短语有哪些
pay attention to doing sth.关注做某事
look forward to doing sth.盼望做某事
admit to doing sth.承认做了某事
apply to doing sth.适用于做某事
object to doing sth.反对做某事
stick to doing sth.坚持做某事
take to doing sth.喜欢上做某事,逐渐习惯做某事
apply oneself to doing sth.专心致力于做某事
devote oneself to doing sth.献身于做某事
动词不定式to的用法
首先,动词不定式符号to无词义。第二,它的形式是后面必须接动词原形,构成不定式短语,第三,在所作的成分上不定式to do通常作主语、表语、状语、宾语、宾语补足语或后置定语。例如:
1. To see is to believe.眼见为实。(to see作主语)
2. My aim is to speak English fluently.我的目标是讲好英语。(作表语)
3. It is never too late to learn.学习从来不迟。(作结果状语)
4. She went home to look after her little sister. 她回家为了照顾她的小妹妹。(作目的状语)
5. I decided to go home. 我希望回家。(作宾语)
6. I asked him to clean the classroom. 我叫他打扫教室。(作宾语补足语)
7. He has many things to do.他有好多事要做。(作后置定语)