How do you know when to use 'less' and 'fewer' when describing things?

Khan Academy Grammarian David Rheinstrom welcomes you to his favorite topic: the study of language, its rules, and its conventions. By understanding English - by speaking it, by writing it, by reading this very sentence - you are a...

David and Paige explain the meaning of two English words that look and sound very similar but act very different: _its_ and _it's_.

We've got a bunch going all at once, here: learn to tell the differences between these eight frequently-confused words.

TL;DW: affect's a verb and effect's a noun. But there's a little more to it than that.

How do you tell the difference between 'compliment' and 'complement', 'desert' and 'dessert'? We'll show you!

When do you use who, and when do you use whom? David, KA's grammarian, explains.

Learn to tell when to use 'hear' instead of 'here' and vice versa; you'll learn how to do the same with 'accept' and 'except'.