4. Faulty parallelism

　　Be sure you use grammatically equal sentence elements to express two or more matching ideas or items in a series.

　　平行结构是很容易出错的，在托福语法中也是出题点，这种错误很容易被忽视。英语我们的是非母语，在语感上来识别错误的可能就降低了。写作和检查的时候注意主胃、动宾的搭配、一致，主动被动的转换。

　　Faulty parallelism

　　The candidate‘s goals include winning the election, a national health program, and the educational system.

　　改正：

　　The candidate‘s goals include winning the election, enacting a national health program, and improving the educational system.

　　原句：

　　Some critics are not so much opposed to capital punishment as postponing it for so long.

　　改正：

　　Some critics are not so much opposed to capital punishment as they are to postponing it for so long.

　　5. Unclear pronoun reference

　　All pronouns must clearly refer to definite referents [nouns].

　　Use it, they, this, that, these, those, and which carefully to prevent confusion.

　　错误的使用代词或模糊的是用代词，是我经常在论坛作文里面发现的。不是说不可以用，但是一定要很清楚地有所指。作文的开头部分，我的建议是尽量不要用很多代词，因为开头部分是整个文章的一个概览，thesis必须clear, 不要怕麻烦，即便是多陈述一遍(不要用原句!换换说法)，也是对thesis的强调，并不累赘。正文、结尾只要使用代词得当就可以了。

　　不要小看代词，它对你思想的表达有的时候很关键，如果指代不清，其他写得再好读者也会confused

　　Unclear pronoun reference

　　Einstein was a brilliant mathematician. This is how he was able to explain the universe.

　　改正：

　　Einstein, who was a brilliant mathematician, used his ability with numbers to explain the universe.

　　原句：

　　Because Senator Martin is less interested in the environment than in economic development, he sometimes neglects it.

　　改正

　　Because of his interest in economic development, Senator Martin sometimes neglects the environment.

　　6. Incorrect pronoun case

　　Determine whether the pronoun is being used as a subject, or an object, or a possessive in the sentence, and select the pronoun form to match.

　　比较弱的错法，不过你敢保证你从没犯过?!

　　Incorrect pronoun case

　　Castro‘s communist principles inevitably led to an ideological conflict between he and President Kennedy.

　　改正：

　　Castro‘s communist principles inevitably led to an ideological conflict between him and President Kennedy.

　　原句：

　　Because strict constructionists recommend fidelity to the Constitution as written, no one objects more than them to judicial reinterpretation.

　　改正：

　　Because strict constructionists recommend fidelity to the Constitution as written, no one objects more than they [do] to judicial reinterpretation.