1. Common Grammar Mistakes

2. to and too to preposition
used for expressing motion or direction toward a point, person, place, or thing approached and reached, as opposed to from.

3. in addition; also; furthermore; moreover: young, clever, and rich too.
adverb
in addition; also; furthermore; moreover: young, clever, and rich too. or
to an excessive extent or degree; beyond what is desirable, fitting, or right: too sick to travel.

4. your Your and You’re Pronoun
a form of the possessive case of you used as an attributive adjective: Your jacket is in that closet. I like your idea.

5. You’re
Contraction
You are

6. There/Their/They’re there adverb
in or at that place (opposed to here): She is there now.
2. at that point in an action, speech, etc.: He stopped there for applause.
3. in that matter, particular, or respect: His anger was justified there.

7. their
a form of the possessive case of they used as an attributive adjective, before a noun: their home; their rights as citizens; their departure for Rome.

8. They’re
Contraction
They are

9. Whose and Who’s Whose pronoun
the possessive case of who used as an adjective: Whose umbrella did I take? Whose is this one?
the possessive case of which used as an adjective: a word whose meaning escapes me; an animal whose fur changes color.
the one or ones belonging to what person or persons: Whose painting won the third prize?

10. Who’s
contraction
Who is or Who has

11. Its pronoun Its and It’s
the possessive form of it (used as an attributive adjective): The book has lost its jacket.

12. It’s
contraction
It is or it has

13. Less or Fewer The traditional rule holds that
fewer should be used for things that can be counted
fewer than four players
while
less should be used with mass terms for things of measurable extent
less paper; less than a gallon of paint

14. Would’ve
ALWAYS
contraction for
Would have
NEVER
Would of