The apostrophe is an important punctuation mark in the English language which is often used incorrectly.

Here are some common incorrect usages of the apostrophe

            - Your’s shoes are red.
            - I went to their’s house.
            - The book’s are on the table.
            - The flower’s are in the vase.

The apostrophe has two distinct uses in English

Used to show possession:
  •   - Bat owned by Ravi – Ravi’s bat
  •   - Doll owned by Sita – Sita’s doll
Used to show contractions of words:
  •   - It is so hot today – It’s so hot today
  •   - I have not done my homework – I haven’t done my homework