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Your vs You're
What's the difference between your and you're? Your presence on this page means you're about to find out.
 
Your
Your is the second person possessive adjective, used to describe something as belonging to you. Your is nearly always followed by a noun.

What is your name?
Is this your pen?
Your book is on the table.
This is your chair and this is mine.
What happened to your dog?
Your being here is causing some problems.

You're
You're is the contraction of "you are" and is often followed by the present participle (verb form ending in -ing).

You're going to be late.
Is that what you're wearing?
I think you're lying.
If you're ready, we can go.
I can't believe you're a doctor!
When you're my age, you'll understand.

 
The Bottom Line
The confusion between your and you're occurs because the two words are pronounced pretty much the same.
The ironclad rule - no exceptions - is that if you're able to replace the word with "you are," you're saying you're. Otherwise, your only choice is your.

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Than vs Then
The English words than and then look and sound a lot alike, but they are completely different. If this distinction is harder than it should be, read this lesson and then try again.
 
Than
Than is a conjunction used in comparisons:

Tom is smarter than Bill.
This is more important than you might think.
Is she taller than you?
Yes, she is taller than I.

Technically, you should use the subject pronoun after than (e.g., I), as opposed to the object pronoun (me). However, English speakers commonly use the object pronoun.
 
Then
Then has numerous meanings.
1. At that point in time

I wasn't ready then.
Will you be home at noon? I'll call you then.

2. Next, afterward

I went to the store, and then to the bank
Do your homework and then go to bed

3. In addition, also, on top of that

He told me he was leaving, and then that I owed him money
It cost $5,000, and then there's tax too

4. In that case, therefore (often with "if")

If you want to go, then you'll have to finish your homework.
I'm hungry!
Then you should eat.

 
The Bottom Line
Than is used only in comparisons, so if you're comparing something use than. If not, then you have to use then. What could be easier than that?

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Their, There, They're
What's the difference between their, there, and they're? They're really not that complicated; once you understand their differences there shouldn't be any more confusion.
 
Their
Their is the third person plural possessive adjective, used to describe something as belong to them. Their is nearly always followed by a noun.

Where is their car?
Are these their pens?
Their books are on the table.
This is their room and this is ours.
What happened to their dog?
Their being here is causing some problems.

There
There has several different uses.
1. Adverb that means the opposite of "here"

He's over there.
Stop right there.
Do you want to sit here or there?

2. Pronoun that introduces a noun or clause.

There is something strange going on.
Is there a phone?

3. Adjective that emphasizes which person.

That guy there seems to be in trouble.
Those there look good.

4. Noun that means "that place."

From there, we drove to Boston.
I'm not going in there!
 

They're
They're is the contraction of "they are" and is often followed by the present participle (verb form ending in -ing).

They're going to be late.
Is that what they're saying?
I think they're lying.
If they're ready, we can go.
I can't believe they're not here yet!
When they're older, they'll understand.

 
The Bottom Line
The confusion between their, there, and they're occurs because the three words are pronounced in very similar ways.
If the word means "belonging to them," use their. If you're able to replace the word with "they are," use they're. Otherwise, there is only one correct answer: there.

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Who's vs Whose
Who knows the difference between who's and whose? Here's a lesson whose time has come.
 
Who's
Who's is a contraction of who is or, less commonly, who has.

Who's watching TV?
Do you know who's going to speak?
Who's ready to go?
Who's in the kitchen?
Who's this?
Who's already eaten?

Whose
Whose is the possessive of who or, somewhat controversially, which.

Whose book is this?
Do you know whose car this is?
I know a woman whose kids study there.
Whose side are you on?
An idea whose time has come.

 
The Bottom Line
The trouble here is due to the apostrophe, which on 99% of English words indicates possession, but on this one simply indicates a contraction. If you can replace the word with who is or who has, use who's. If not, use whose.

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