Most word mix-ups come from a small set of look-alike, sound-alike pairs — and each has a simple trick to keep them straight. These slip past spellcheck because the wrong word is still spelled correctly, so they’re worth memorizing once.
Affect vs effect
Affect is usually a verb (to influence); effect is usually a noun (the result). Trick: Affect = Action (verb); Effect = End result (noun). “The weather affects my mood” → “the effect was obvious.”
Their / there / they’re
- Their = possession (“their car”).
- There = place (“over there”).
- They’re = they are (“they’re late”).
Trick: “they’re” only works if you can expand it to “they are.”
Your vs you’re
Your = possession (“your idea”); you’re = you are (“you’re right”). Same expand-it test.
Its vs it’s
Its = possession (“the dog wagged its tail”); it’s = it is / it has (“it’s raining”). The apostrophe means a missing word, not possession — this trips up almost everyone.
Then vs than
Then = time or sequence (“we ate, then left”); than = comparison (“bigger than before”).
Fewer vs less
Fewer for things you can count (“fewer emails”); less for things you can’t (“less time”).
Lose vs loose
Lose = to misplace or not win (“don’t lose it”); loose = not tight (“a loose screw”).
Complement vs compliment
Complement = completes something (“wine complements the meal”); compliment = praise (“a kind compliment”).
How to catch these every time
These errors hide from spellcheck but not from a grammar tool that reads context. After drafting, run your text through the grammar checker — it flags the wrong-word slips a spell checker misses. And when you read your work aloud, your ear often catches what your eye accepted — pair it with a proofreading checklist.
Learn the tricks once, and these stop being mistakes you make and become mistakes you spot.
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