1. THERE/THEY’RE/THEIR
There – a place/location; (There is my favourite restaurant.)
They’re – they are; (They’re the best people I have ever met.)
Their – belonging to more than one person; (Their dog is so sweet.)
2. YOUR/YOU’RE
Your – the possessive form of “you”; (Your writing is amazing.)
You’re – you are; (You’re amazing.)
3. ITS/IT’S
Its – the possessive form of “it”; (The chameleon changes the colour of its skin.)
It’s – it is; (It’s a great book.)
4. WHO’S/WHOSE
Who’s – who is; (Who’s there?)
Whose – the possessive form of “whom”; (“And whose fault is that”?)
5. THE RANDOM APOSTROPHE
Don’t use an apostrophe + s to make a regular noun plural.
INCORRECT: I would love to plant some more tree’s.
CORRECT: I would love to plant some more trees.
The personal pronouns never take an apostrophe.
INCORRECT: Talking to one’s self in public is odd.
CORRECT: Talking to oneself in public is odd.
Never use apostrophes with adjectives.
INCORRECT: He’s a United State’s citizen.
CORRECT: He’s a United States citizen.