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From TIGHAR
Plurals, Possessives, and Contractions
1. Plurals are usually formed by adding "s" to words WITHOUT an apostrophe:
one hat ----> two hats 1960 ----> 1960s Hindu---->Hindus
2. Possession by one person or thing is usually indicated by adding an apostrophe and an "s":
The hat's brim was bent. The Hindu's home was new.
3. Possession by more than one person or thing is indicated by adding an "s" and an apostrophe:
The hats' labels were all sewn on backwards. The Sabres' playoff chances are melting like snow in springtime.
4. Contractions use an apostrophe to indicate missing letters:
do not ----> don't cannot ----> can't <Please note that cannot is one word, not two!> is not ----> isn't
5. Distinguish possessives from contractions:
its == "belongs to it" "The groundhog saw its shadow." it's == "it is" or "it has" "It's cold today. It's been raining, too." your == "belongs to you" whose == "belongs to who" you're == "you are" who's == "who is"
- "Its" is an exception to first and third rules above. Adding the "s" doesn't turn "it" into a plural; possession, in this case, is NOT indicated by adding an apostrophe and "s"!
- "It's" looks like a possessive because of that stupid apostrophe, but it's a contraction.
- "Its" fits into a normal pattern of possessive pronouns, none of which use the apostrophe: his, hers, its, yours, ours, theirs.
- The ability to apply rules to specific situations, making allowances for exceptions to the rules, is one sign of intelligent life.
- It's is not, it isn't ain't,
- and it's it's, not its, if you mean it is.
- If you don't, it's its.
- Then too, it's hers. It isn't her's.
- It isn't our's either.
- It's ours, and likewise yours and theirs.
- Oxford University Press, Edpress News
- It's is not, it isn't ain't,