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Buy, by, or bye
They sound the same: buy means pay for something, by shows how, where, when, or who, and bye is a short goodbye.
Quick rule
Paying for something? Buy. Saying how, where, when, or who? By. Saying goodbye to someone? Bye.
To get something by paying money for it. Its past is bought.
A preposition that says how, where, when, or who: by bus, by the door, by Friday, by my cousin.
A short way to say goodbye when you leave someone: Bye! See you tomorrow.
How to choose
| Question | buy | by | bye |
|---|---|---|---|
| Can you swap it for purchase (Let's ___ a gift)? | Yes | No | No |
| Does it say how, where, when, or who (___ the door, ___ bus)? | No | Yes | No |
| Is it a farewell ("___, see you!")? | No | No | Yes |
Why it trips people up
Buy, by, and bye are homophones: all three are pronounced /baɪ/. Only the spelling shows which one is meant, so the mix-up appears in writing, especially in texts typed quickly.
How they sound
All three are pronounced /baɪ/, in American and British English alike.
- buy/baɪ/
- by/baɪ/
- bye/baɪ/
How each one works
Buy
Paying for something
Where did you buy those boots?
A planned purchase
We should buy fruit at the market on Saturday.
Past form: bought
She bought her first car with her own savings.
By
Where: next to
The keys are by the door.
How: the means
We came to the city by train.
Who: the author
This poem was written by my aunt.
When: no later than
Please call me back by six.
Bye
A farewell
Bye! See you at school tomorrow.
Say bye to someone
Wave bye to Grandma, sweetie.
Say bye
At the airport, we hugged and said bye.
In a conversation
- A:
Did you buy the tickets for Friday?
- B:
Not yet. I will do it by tonight.
- A:
Good. Text me when they are in your cart.
- B:
I will. Talk later!
- A:
Bye for now!
Common mistakes
Wrong: Buy the way, did you get my email?
Right: By the way, did you get my email?
In a quick text, the spelling of by the way slips to buy. Nothing is being purchased, so it stays by.
Wrong: Bye the end of the month, we will have moved.
Right: By the end of the month, we will have moved.
A deadline or time limit takes by. Bye is the farewell.
Memory trick
If purchase fits, it is buy, the one with the u. If it sits next to another word to say how, where, or when (by bus), it is by, the short one. If you are saying farewell, it is bye, which ends in e like goodbye.
It depends
- The many senses of by
- Besides how, where, and when, by shows who made something (a play by Ibsen) and by how much something changed (up by 10%). It is still one word.
- Bye and bye-bye
- Oxford defines bye as goodbye and uses bye-bye in an example (She waved bye-bye).
FAQ
By or bye: which is correct?
By is the preposition (by the door, by Friday). Bye is the farewell (Bye, see you tomorrow). They are pronounced the same.
What is the difference between buy and by?
Buy is a verb meaning to get something for money. By is a preposition that shows how, where, when, or who.