4. in front of, in the front of
in front of 表示“在某人或某物的前面”，在某个范围以外；in the front of 表示“在……的前部”，在某个范围以内。例如：
There are some tall trees in front of the building. 大楼前有一些高大的树。
The teacher is sitting in the front of the classroom. 老师坐在教室前面。
5. among, between
两者都含有“在……中间”的意思。 一般说法是：among 用于“三者或三者以上之间”，而 between 则用于“两者之间”。例如：
I bought three hundred eggs and there was not a single bad one among them. 我买了三百鸡蛋，里面一个坏的也没有。
What's the difference between Asian elephants and African elephants? 亚洲象与非洲象有什么不同？
不过这个定义过于简单。Oxford上对于两者的解释是："Among" is used of people or things considered as a group. "Between" is used of people or things, either two in number or more than two considered individually.
1) among 除了表示多于两者之间的关系外，更重要是它表达了“在其中”的意思。究竟是多少人或事并不重要，因为他们/它们已经被视为一体。例如：
He stood among the crowd. 他站在人群中。
There is a thief among you. 你们中间有一个是小偷。
She divided the money among her three children. 她把钱分给了她的三个孩子。
2) Between 可用于“三者或三者以上之间”，指每个人或物与别的每个人或物分别发生联系，例如：
A treaty was signed between Great Britain, France and the United States. 英国同法国、美国分别有协定。
Ecuador lies between Columbia, Peru, and the Pacific Ocean. 厄瓜多尔位于哥伦比亚、秘鲁和太平洋之间。
3) Between 在表示“合作、协力”的意义时，其宾语不受所涉及到的个体数目的限制。例如：
The three children saved over a hundred pounds between them. 三个孩子一共赚了一百多英镑。
The three men tried to lift the box between them. 三个人一齐用力想把箱子抬起来。
Among 也有相同的用法：
They finished the work among themselves. 他们共同完成了这项工作。
实习编辑：褚萍湘
