里有一种错叫根本不知道哪里有错。这类错误跟语法的严谨和语言习惯有关系。比如，用逗号把对句子主旨并非重要的非限定性定语从句分开；又比如，不要用逗号把对句意直接起作用的短语分开。接下来看看GMAT内容：gmat作文官方题库范文大全经典对错分析
1、Use commas to enclose nonrestrictive phrases, which are not essential to the sentence's meaning.
The bus driver with her ears tuned to the roar decided to take the grumbling bus on a detour across the football field.
The bus driver, her ears tuned to the roar, decided to take the grumbling bus on a detour across the football field.
My window as dirty as it is reveals the beauty of nature on a snowy morning.
My window, as dirty as it is, reveals the beauty of nature on a snowy morning.
King and Lucille, his customized black Gibsons have electrified audiences all over the world.
King and Lucille, his customized black Gibsons, have electrified audiences all over the world.
2、Do not use commas to bracket phrases that are essential to a sentence's meaning.
Incorrect -- Correct
The man, who has too many ties, has too few necks.
The man who has too many ties has too few necks.
The cats, with six toes, are a unique attraction of the tour of Hemingway's house.
The cats with six toes are a unique attraction of the tour of Hemingway's house.
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