1．组段应遵循的两个原则
(1)统一性原则
一段话只能有一个中心，每句话都只能围绕这个中心去阐述，不能随心所欲地添加一些与中心无关的句子。下面是一个缺乏统一性的段落：
The other day my brother and I went to the cinema by bicycle. Pointing to a policeman not far away, the young man explained. He stopped us about half an hour ago and made us catch the next offender. As we came to the crossroads a young man and a girl came up and stopped us. My brother was riding with me sitting on the seat behind. We bought the bicycle.
[分析] 本段内容缺乏统一性，句与句之间关联性不大，貌似每句话表达一个中心意思。语意颠倒，而且最后一句与中心无关。正确内容如下：
The other day my brother and I went to the cinema by bicycle. My brother was riding with me sitting on the seat behind. As we came to the crossroads a young man and a girl came up and stopped us. Pointing to a policeman not far away, the young man explained, “He stopped us about half an hour ago and made us catch the next offender.”
(2)连贯性原则
指句与句、段与段过渡自然(和谐、流畅，层次分明，符合逻辑)。保持段落的连贯性就应恰如其分地运用过渡语，使内容承前启后。如：first, at first, second, and then, finally, what's more, but, however, such as, thus, as a result, in fact, therefore, in a word, in short等。
