看你的提问我觉得你像是高中生吧?!
首先
among是介词,与on,in,等词汇是一样的性质的,但是它的意思是在什么之间,一般是属于三个对象以上的比较!
例如:
There are three apples among John,Lily and me.
另外三个都是属于副词,类似于程度比较的意思;
amost是几乎,就快,的意思,相当于:nearly;
例如:
It's almost three to ten.
mostly表示大多数,大多数情况,大多人,多半的意思;相当于almost;
例如:
Mostly,when it's Sunday,it is his turn to do this job.
along是伴同,一起,伴随的意思,一般陪同动词产生意义;相当于together;
例如:
Tomorrow I would like to go on a picnic,would you come along?
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