主谓一致：The number of sth is decreasing.

　　A great number of sth are….

　　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.

　　名词的数：

　　phenomenon phenomena/phenomenons

　　medium media

　　bacterium bacteria

　　介词搭配

　　insist on persist in

　　I insist that we should do sth.

　　I insist on doing sth. I persist in doing sth.

　　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

　　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。