What is the proper Use of the Apostrophe
Basically, you use an apostrophe in two cases:
If still in doubt, leave the apostrophe out. It causes more reader confusion to insert an apostrophe where it doesn’t belong than it does to omit one. Plus, you can always plead the typo defense if you leave an apostrophe out, but you look unavoidably dumb when you stick one where it doesn’t belong.
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