Informal: He spent more time playing computer games than me.
Formal: He spent more time playing computer games than I.
2. 在表达“让步”概念时，很多考生选择使用的but, anyway, all the same, though, although等为非正式文体常用词语表达。正式文体则常使用yet, however, nevertheless, in spite of (despite), notwithstanding等词语，
Informal: He tried to overcome his addiction to the Internet, but he failed.
Formal: He endeavoured to overcome his addiction to the Internet; however, it turned out to be a failure.
4. 在表达“原因”、“后果”等概念时，很多考生由于水平所限，总是使用非正式文体常用的so, because或其他形式的表示原因的从句，正式文体则常用 on account of, accordingly, thus, hence, consequently, owing to (the fact that…)等词或词组，且比较经常地运用分词短语、独立主格结构等。
Informal: Since computers had proliferated, many people become addicted to the Internet.
Formal: Computers having proliferated, many people become addicted to the Internet.
5. 在构成表示“目的”的状语时，很多考生使用具有非正式文体色彩的so as to；其实，用in order that引导的目的状语从句常出现于正式文体中：
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.