我们都知道，英语的作文是由一个个句子而构成的。要想让一篇作文很出彩，首先得保证构成文章的每一个句子是正确的，其次才会上升到去考虑措词的准确性。鉴于同学们在写大作文时，会出现一些共性的错误，医学全在线就常见的错误给大家做了一个汇总，希望大家能够引起足够的重视。
A. 主谓一致：The number of sth is decreasing.
A great number of sth are….
B. 时态语态：
描述图画用进行时: doing
As is shown in the picture, there is sb doing sth, suggesting sth/with sb doing sth.
描述图表用过去时: 完成时
As is illustrated by the chart, there was an obvious increase/a dramatic decrease in the number of sth from 1998 to 2008.
There has been an increase…(from 1998 to 2013)
The number of sth has been increasing…
预测趋势用一般将来时: will
The situation will develop for the/a better/worse direction.
C. 名词的数：
phenomenon phenomena/phenomenons
medium media
bacterium bacteria
D. 介词搭配医,学.全,在.线www.med126.com
insist on persist in
I insist that we should do sth.
I insist on doing sth. I persist in doing sth.
E. 单词大小写及拼写错误
题目的大小写（除冠词、连词和介词外， 其他词原则上都应该第一个字母大写);
Human Needs and Wants
每句话的第一个字母和直接引语的第一个字母要大写;
He said, “He is going to Shanghai next week”.
专有名词（人名，地名)和缩写字母要大写；
头衔在专有名词前要大写，在专有名词后则小写；
Caption Smith——Smith, the captain
Uncle George——George, my uncle
F. 标点符号
写文章时，切忌从头到尾只用逗号的现象；要正确使用逗号和分号。
