Informal: We should do more outdoor activities so as to enrich our life.
Formal: We should do more outdoor activities in order that our life gets enriched.
6. 很多考生不会使用由引导词it引导的句子（如it is said that…)，实际上，这一结构多见于正式文体，不用这一结构而表达同一意义的句子多见于非正式文体：
Informal: The number of students in the classroom has been going down.
Formal: It has been noted with concern that the number of students attending class has been declining alarmingly.
7. 很多考生省略关系代词、连词、介词，这些情况多见于非正式文体。
Informal: He flunked many courses. He had been expelled from the college.
Formal: He flunked so many courses that he had been expelled from the college.
Informal: He dealt with the problem the way his classmates does.
Formal: He dealt with the problem in the way his classmates does.
Informal: We should prevent it going from bad to worse.
Formal: We should prevent it from going from bad to worse.
8. 在表达“请求某人做某事时”，很多考生选择使用具有非正式文体色彩的主动语态句式，而没有使用具有正式文体色彩的被动语态句式。
Informal: Please communicate more with your friends and family.
Formal: More communication with your friends and family is needed.
9. 很多考生未能正确使用某些不定代词、动名词的复合结构，不太注意句子的主谓一致，未能体现文章的正式文体风格。
Informal: Everybody should look after themselves.
Formal: Everybody should look after himself.
Informal: Everyone should do their best.
Formal: Everyone should do his best.
Informal: I’m not surprised at him failing the course.Formal: I am not surprised at his failing the course.
