Apologize vs I am so sorry vs Regret

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

Apologize

Top 1,000 (very common)B1verb

I am so sorry

Top 2,000 (common)

Regret

Top 1,000 (very common)B2verb
 ApologizeI am so sorryRegret
Pronunciation🇬🇧 /["/əˈpɒlədʒaɪz/","/əˈpɒlədʒaɪzɪz/","/əˈpɒlədʒaɪzd/","/əˈpɒlədʒaɪzɪŋ/"]/🇺🇸 /["/əˈpɑːlədʒaɪz/","/əˈpɑːlədʒaɪzɪz/","/əˈpɑːlədʒaɪzd/","/əˈpɑːlədʒaɪzɪŋ/"]/🇬🇧 //aɪ æm səʊ ˈsɒr.i//🇺🇸 //aɪ æm soʊ ˈsɔr.i//🇬🇧 /["/rɪˈɡret/","/rɪˈɡrets/","/rɪˈɡretɪd/","/rɪˈɡretɪŋ/"]/🇺🇸 /["/rɪˈɡret/","/rɪˈɡrets/","/rɪˈɡretɪd/","/rɪˈɡretɪŋ/"]/
MeaningTo say sorry for something you did wrong.I feel bad for what I did.To feel sad or sorry about something you did or didn't do.
ExampleI had to apologize to her for breaking her favorite vase.I am so sorry for arriving late to the meeting.I regret not studying harder for my exams.
RegisterNeutralNeutralNeutral
How commonTop 1,000 (very common)Top 2,000 (common)Top 1,000 (very common)
CEFR levelB1-B2
Part of speechverbverb
Collocationssincerely, profusely, humbly, ought to, should, want to, for, to, I do apologize, I must apologizedeeply sorry, truly sorry, very sorrybitterly, deeply, greatly, begin to, come to, grow to, bitterly, deeply, greatly, begin to, come to, grow to
Antonymsignore, offend, upsetunapologetic, indifferent, unremorsefulsatisfaction, contentment, pride
Common mistakesConfusing 'apologize' with 'apology' (the noun form)., Using 'apologize' without specifying whom you are apologizing to., Mistakenly using past tense 'apologized' when 'apologize' is correct in present tense.Using 'sorry' without the subject, 'I am sorry' is more polite., Confusing with 'excuse me' which is less formal., Overusing this phrase in situations where a simple 'thanks' suffices.'Regret' is often confused with 'remorse'. Remorse includes a stronger sense of guilt., Learners might say 'I regret to do...' instead of 'I regret doing...'., Confusion between 'regret' and 'regrettable' which is an adjective.
Usage notesUse 'apologize' in situations where you need to express regret for your actions. It's appropriate in both formal and informal contexts, but be cautious using it in very casual situations where slang may be preferred.Use this phrase when you apologize; it is suitable in most situations, personal or professional. Avoid in casual or joking contexts, where a lighter phrase might be appropriate.Use 'regret' to express feelings about past actions. It's appropriate in neutral to formal contexts, but less so in casual conversations where simpler phrases might fit better.

See it in real clips

Apologize
I am so sorry
Regret

Frequently asked questions: Apologize vs I am so sorry vs Regret

What's the difference between Apologize, I am so sorry, and Regret?

Apologize: To say sorry for something you did wrong. I am so sorry: I feel bad for what I did. Regret: To feel sad or sorry about something you did or didn't do.

Which is more advanced: Apologize, I am so sorry, and Regret?

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

Can you show an example of each?

Apologize: I had to apologize to her for breaking her favorite vase. I am so sorry: I am so sorry for arriving late to the meeting. Regret: I regret not studying harder for my exams.

Can I use Apologize, I am so sorry, and Regret interchangeably?

Not always. Apologize, I am so sorry, and Regret 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.