English is full of word pairs that look or sound almost the same but mean completely different things. Mixing them up is one of the most common writing mistakes — even for native speakers. The good news? Each pair has a simple trick that makes the difference stick.
Here are 15 commonly confused English words, what each one means, an example sentence, and a memory tip you can use the next time you hesitate.
1. Affect vs. Effect
Affect is usually a verb meaning “to influence.” Effect is usually a noun meaning “a result.”
Example: The rain affected the match. The rain had a big effect on the match.
Memory tip: Remember A for Action (verb), E for End result (noun).
2. Then vs. Than
Then is about time or sequence. Than is used for comparisons.
Example: Finish your work, then relax. She is taller than her brother.
Memory tip: Then has an e like “when.” Than has an a like “compare.”
3. Their vs. There vs. They’re
Their shows ownership, there refers to a place, and they’re is short for “they are.”
Example: They’re leaving their bags over there.
Memory tip: If you can replace it with “they are,” use they’re. “There” contains “here,” a place.
4. Your vs. You’re
Your shows possession. You’re means “you are.”
Example: You’re going to love your new phone.
Memory tip: Expand it: if “you are” fits, write you’re.
5. Its vs. It’s
Its is possessive. It’s means “it is” or “it has.”
Example: It’s raining, and the dog is wagging its tail.
Memory tip: Possessive pronouns (his, hers, its) never take an apostrophe.
6. Lose vs. Loose
Lose (verb) means to misplace or fail to win. Loose (adjective) means not tight.
Example: Don’t lose your keys. These jeans feel loose.
Memory tip: “Loose” has an extra o — it’s too loose to hold it in.
7. Accept vs. Except
Accept means to receive or agree to. Except means “excluding.”
Example: I accept your offer. Everyone came except Ram.
Memory tip: Except excludes.
8. Complement vs. Compliment
A complement completes something. A compliment is praise.
Example: The sauce complements the rice. She gave me a kind compliment.
Memory tip: Complement enhances/completes; compliment is what I like to hear.
9. Principal vs. Principle
Principal means main, or the head of a school. A principle is a rule or belief.
Example: The principal explained the school’s guiding principles.
Memory tip: A principle is a rule. The principal is your pal.
10. Stationary vs. Stationery
Stationary means not moving. Stationery is writing paper and supplies.
Example: The bus was stationary. I bought new stationery.
Memory tip: Stationery is for envelopes; stationary is standing still.
11. Advice vs. Advise
Advice is a noun (a recommendation). Advise is a verb (to recommend).
Example: I advise you to listen to her advice.
Memory tip: Advice is a thing, like ice. Advise is an action.
12. Fewer vs. Less
Use fewer for things you can count, less for amounts you can’t.
Example: Fewer cars means less traffic.
Memory tip: Can you put a number in front of it? Use “fewer.”
13. Lie vs. Lay
Lie means to recline (no object). Lay means to put something down (needs an object).
Example: I need to lie down. Lay the book on the table.
Memory tip: You lay something; you just lie. (Careful: the past tense of “lie” is “lay”!)
14. Ensure vs. Insure
Ensure means to make certain. Insure means to protect with an insurance policy.
Example: Please ensure the door is locked. We insured the car.
Memory tip: Insure involves an insurance company.
15. Farther vs. Further
Farther refers to physical distance. Further refers to extent or degree.
Example: Pokhara is farther than I thought. Let’s discuss this further.
Memory tip: Farther is about far distances you can measure.
Quick Self-Check
Choose the correct word in each sentence (answers below):
- The new rule will (affect / effect) everyone.
- (Its / It’s) been a long day.
- I have (fewer / less) friends here (then / than) back home.
- Can you (advise / advice) me on which laptop to buy?
Answers: affect, It’s, fewer / than, advise.
Final Thoughts
You don’t need to memorise grammar rules to get these right — just one memorable trick per pair. Bookmark this page, and whenever you’re unsure of a word’s meaning, look it up on MeaningBy.