TO WHOM IT MAY CONCERN.
4 Công dụng của dấu Phẩy Trên
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Apostrophe [']. This punctuation mark does four things.
First, it often shows possession:
>Dan Lindler's appointment.
Second, it frequently marks the omission of letters--including the formation of contractions:
> finger lickin' good, he'll, won't.
Third, it's used in abbreviations of years and decades: the class of '68, the '90s. It's not used, however, in plurals of decades: the '70s, the 1980s.
And fourth, it sometimes marks the plural of single letters and abbreviations with internal punctuation: Dot your i's. She got straight A's on her report card. M.A.'s. See abbreviations and acronyms, contractions, it's, its, plurals, possessives.

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