When I was studying for my CELPIP exam I got material from them. Unfortunately, I can not put the PDF to the public because it has a watermark with my personal email. But I can put you here what it says.
CELPIP's nineteenth error as they state:
The apostrophe has only two uses: to show possession and to indicate an omission in spelling. Nevertheless, this punctuation symbol is often used in error, even by native English speakers. Therefore, it is wise to review its use.
|To form the possessive of singular nouns||All in a day's work. |
Mr. Stone's dog is so cute.
|To form the possessive of plural nouns||The women's association does very charitable work. |
The Stones' dog is so cute.
|To show the omission of letters or numbers||I don't work on Sundays. (do not) |
I graduated in the Class of '94 (1994)
|To form the plural of letters, numbers, symbols, and referred-to words||I got five A's and a B on my report card. |
His 5's look like 7's.
The @'s in email addresses always precede the company name.
Try not to use so many "but's" in your sentences.
We don't use apostrophes with possessive pronouns:
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