particle（语法中的）小品词
In grammar, a particle is a preposition such as 'into' or an adverb such as 'out' which can combine with a verb to form a phrasal verb.
（在语法中,小品词是一个类似“into"之类的介词或"out"之类的副词,可以与动词组合成一个动词词组.)
常见的有：
up,down,in,out,on,off,over,away
1. 后有宾语,则是介词,换句话说,介词后面得有宾语.
He fell off his bike.
I lwent over his book.
2. 后没有宾语,就是副词.
如:
He fell off and hurt his leg.
3. 及物动词+副词,也可以加宾语的.这种情况下,宾语可以放在副词前.
如：
He put out the fire.=He put the fire out.这就是副词的.
4. 还有这种结构：v+adv+介词+宾语
如：
He went on with the work.
Don't look down on women.