Occasionally vs Sometimes

When to use each in English, with meaning, register, and examples.

Occasionally

Top 2,000 (common) B2 adverb

Sometimes

Top 1,000 (very common) A1 adverb

Most common: Sometimes

	Occasionally	Sometimes
Pronunciation	🇬🇧 /["/əˈkeɪʒnəli/"]/ 🇺🇸 /["/əˈkeɪʒnəli/"]/	🇬🇧 /["/ˈsʌmtaɪmz/"]/ 🇺🇸 /["/ˈsʌmtaɪmz/"]/
Meaning	Sometimes, but not often.	at certain times, but not always
Example	We occasionally meet for a drink after work.	Sometimes I like to go for a walk in the park.
Register	Neutral	Neutral
How common	Top 2,000 (common)	Top 1,000 (very common)
CEFR level	B2	A1
Part of speech	adverb	adverb
Collocations	occurs occasionally, rarely used occasionally, happens occasionally	sometimes I feel, sometimes it happens, sometimes you need, sometimes more is less, sometimes in life
Antonyms	frequently, often, regularly	always, never
Common mistakes	Using 'occasionally' when 'often' is more appropriate., Confusing 'occasionally' with 'occasion' (which is a noun)., Adding unnecessary prepositions, e.g., 'occasionally at'.	Confuse with 'sometimes' and 'sometime' - they have different meanings., Using 'sometimes' when 'always' is meant., Incorrect placement in a sentence, e.g., 'I eat sometimes apples.'
Usage notes	Used in both spoken and written English. It often implies that something happens at irregular intervals, which makes it less formal than some alternatives, but still appropriate for most contexts.	Used to indicate regularity in actions, but not consistency. It's appropriate in both spoken and written contexts; avoid in very formal writing.

See it in real clips

Agent Carter › S1 E1

Yeah, we occasionally use them in our experiments to stabilize the...

Occasionally

Breaking Bad › S1 E7

Yeah, well, sometimes forbidden fruit tastes the sweetest, doesn't it?

the way they sometimes precede their idea with a little phrase, see, like...

Breaking Bad › S1 E5

sometimes your luck can change.

Breaking Bad › S1 E7

Yeah, well, sometimes forbidden fruit tastes the sweetest, doesn't it?

the way they sometimes precede their idea with a little phrase, see, like...

Sometimes

Frequently asked questions: Occasionally vs Sometimes

What's the difference between Occasionally and Sometimes?

Occasionally: Sometimes, but not often. Sometimes: at certain times, but not always

Which is more common: Occasionally and Sometimes?

Sometimes is the most common in everyday English.

Which is more advanced: Occasionally and Sometimes?

Occasionally is the highest level, at B2, on the CEFR scale.

Are Occasionally and Sometimes the same CEFR level?

Occasionally: B2, Sometimes: A1 on the CEFR scale.

What part of speech are Occasionally and Sometimes?

Occasionally: adverb, Sometimes: adverb.

Can you show an example of each?

Occasionally: We occasionally meet for a drink after work. Sometimes: Sometimes I like to go for a walk in the park.

Can I use Occasionally and Sometimes interchangeably?

Not always. Occasionally and Sometimes are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.