When do I use "Only" and when do I use "Just"?

"Only" = exclusively / nothing but. "Just" = only (informal) + moments ago + simply.

What is the most common mistake with "Only" and "Just"?

"Just" and "only" are interchangeable for exclusivity ("I just/only have $5"), but "just" also signals recent time, a use "only" cannot cover. "I just ate" = moments ago; "I only ate" implies restriction, not recency.

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Which one to use?Intermediateadverbio / adjetivoadverbio

OnlyvsJust

"Only" emphasizes exclusivity; "just" can mean "barely", "simply", or "moments ago".

Side-by-side comparison

Only

adverbio / adjetivo

Exclusively, nothing more than. Indicates there are no other options or elements.

Only three students passed the exam.
She is the only person who knows the truth.
I only eat meat on weekends.

Just

adverbio

Simply (minimizes). Barely (almost not). Moments ago (very recent time). Exactly.

I just arrived. Can I sit down first?
Just take a deep breath. Everything will be fine.
I just barely made it to the meeting on time.

Common mistake

•"Just" and "only" are interchangeable for exclusivity ("I just/only have $5"), but "just" also signals recent time, a use "only" cannot cover.
•"I just ate" = moments ago; "I only ate" implies restriction, not recency.

Trick to remember it

For recent time, only "just" works: "I just saw her" (moments ago) cannot become "I only saw her." For pure exclusivity, both work.

Quick rule

•"Only" = exclusively / nothing but.
•"Just" = only (informal) + moments ago + simply.

Did you know?

JUST is one of the most polysemous (multiple-meaning) words in English. The Oxford English Dictionary lists more than 15 distinct uses of JUST as an adverb, plus its use as an adjective ("a just ruler" = a fair, righteous ruler). It is curious that the same word that minimizes ("it's just a small thing") also denotes moral justice in its adjectival form ("a just society"). These double meanings have distinct historical roots: JUST meaning "moments ago" comes from Latin "iuxta" (near, close), while JUST meaning "fair/righteous" comes from Latin "iustus" (right, lawful).