在正式写作中应防止用缩写形式。 缩写即是将两个词合二为一，譬如 don't, can't, 和isn't。在正式的法律文书中用缩写形式是不规范的。
Incorrect: He can't guarantee that the defendant3 will appear because the defendant hasn't called him in several days.
Correct: He can not guarantee that the defendant will appear because the defendant has not called him in several days.
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.
记住：It's是it is的缩写形式，而its是it的单数所有格形式。
Correct use as Possessive: 所有格的正确用：
My '68 Mustang is on its last journey.
Correct use as Contraction: 缩写形式的正确用：
It's a long way from Tipperary.
Cross References: Apostrophes, Possessives 参考：省略符号，所有格
