from是名词还是动词

介词 prep.
1.从...起,始于
She is singing from morning to night.
她从早唱到晚.
2.从;由
He rose from office boy to managing director in fifteen years.
他十五年里从办公室勤杂员升到总经理.
3.离(开)
Our school is two miles from the station.
我们学校离车站两英里.
4.从...来;出自
He comes from Shanghai.
他来自上海.
5.(表示去除、免掉、阻止、剥夺等)
The pill will relieve you from pain.
这药丸将使你免受痛苦.
6.(表示区别、比较)
He is old enough to know right from wrong.
他已长大,能够辨别是非了.
7.(表示原料)由
Flour is made from wheat.
面粉由小麦制成.
8.因为,由于;出于
He wasn't ill; he stayed in bed from laziness.
他没病,躺在床上是因懒惰之故.
He is trembling from fear.
他吓得发抖.