1. Avoid using contractions in formal writing. A contraction is a combination of two words as one, such as "don't," "can't," and "isn't." The use of contractions is inappropriate in formal legal writing. Replace them with the two-word version of the contraction.

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　　在正式写作中应避免使用缩写形式。 缩写即是将两个词合二为一，比如 "don't," "can't," 和"isn't"。在正式的法律文书中使用缩写形式是不规范的。

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　　Incorrect: He can't guarantee that the defendant will appear because the defendant hasn't called him in several days. (来源：英语e问e答 http://ask.englishcn.com)

　　Correct: He can not guarantee that the defendant will appear because the defendant has not called him in several days. (来源：英语电影下载 http://bt.englishcn.com)

　　2. Remember: "It's" is the contraction of "it is." The term "its" is the singular possessive of "it." The term "it's," by contrast, is the contraction of "it is."

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　　记住：“It's”是“it is”的缩写形式，而“its”是“it”的单数所有格形式。 (来源：英语麦当劳－英语杂志 EnglishCN.com)

　　Correct use as Possessive: 所有格的正确使用： (来源：英语e问e答 http://ask.englishcn.com)

　　My '68 Mustang is on its last journey. (来源：英语麦当劳www.EnglishCN.com)

　　Correct use as Contraction: 缩写形式的正确使用： (来源：英语问答中心 http://ask.englishcn.com)

　　It's a long way from Tipperary. (来源：最老牌的英语学习网站 EnglishCN.com)

　　Cross References: Apostrophes, Possessives 参考：省略符号，所有格 (来源：EnglishCN英语博客基地)