Short, practical guides to the words people mix up most often. Each one gives you the quick answer, real examples and a memory trick so the rule sticks.

Commonly confused words

• A lot or alot?Which spelling is correct
• Their, there or they’re?Three words, three meanings
• Your or you’re?Possession vs you are
• Its or it’s?The apostrophe rule
• Affect or effect?Verb vs noun
• Then or than?Time vs comparison
• Could have or could of?Why “of” is wrong
• Lose or loose?One O or two
• To, too or two?Direction, also, number
• Who or whom?Subject vs object

Check your own writing

Knowing the rule is half the job. The SpellMistake grammar checker catches these mix-ups automatically and explains every fix, so you can learn as you write.