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the apostrophe was used in place of a vowel letter .... For most singular nouns the ending 's is added; e.g., the cat's whiskers
There are two main case to use apostrophes as follow:
1. Apostrophe is used for showing possession which means to own something or belongs to.
- The bird's cage was cleaned by my brother. (It comes after singular noun and added s)
- It is Andy's book. (It comes after pesonal name and added s)
- She runs women's clothing business. (It comes after plural noun and added s)
- Charles' Hospital is the best hospital in this city. (It comes after name of place which end in s)
- She needs a new shoes' rack (it comes after plural noun which is end in s)
2. Apostrophe is used for showing omision or contraction
- I'm = I am
- I'll = I will
- Don't = do not
- Didn't = did not
- It's = It is or It has
- etc
possession and abbrieviations
Frogs' legs It's a car shan't= shall not
nice comprehensive answer by ismi puji......... agreed
it is used to show possessive case in grammar