se vs sie, What's the Difference?

Which to use

“se” is a conjunction and “sie” is a pronoun - they look or sound alike but fill different roles in a sentence.

#16
“se” frequency rank: #40,788
“sie” frequency rank: 40804
confusion score

Side-by-Side Comparison

Feature	se	sie
Definition	indica hipótese	ela, pronome pessoal feminino do caso nominativo da terceira pessoa do singular:

Where the eye mixes se and sie

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

2 ch

3 ch

sie

Visual trap between se and sie

These two trip readers on the page rather than in the ear: se is /sɨ/ while sie is /zi:/ ouvir^(fonte ?) ouvir^(fonte ?). Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (conjunction vs pronoun), which is usually the fastest check. Our composite confusion score for this pair is 40804, derived from the frequency rank of both members and their visual similarity.

se is recorded at frequency rank #16, classified as aconj, pronounced /sɨ/. sie is at rank #40,788, tagged as apron, pronounced /zi:/ ouvir^(fonte ?) ouvir^(fonte ?).

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 40804, this pair ranks #25,242 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of se vs sie

Shared letters: es. Private to "se": -. Private to "sie": i.

"se" · 2 letters · shape CV · "sie" · 3 letters · shape CVV

Frequently Asked Questions

Is swapping "se" for "sie" ever safe?

No - they are not even the same part of speech. "se" is a conjunction and "sie" a pronoun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "se" or "sie"?

"se" is the more common of the two: it sits at frequency rank #16 in our Portuguese list, against #40,788 for "sie". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "se" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sie" - compare definitions side by side with the headword page. Word entry
This pair ranks #25,242 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"se" and "sie" also get mixed up with nearby pairs, the highest-scored neighbour is "Sau vs sie". Nearby pair

Confusion rank #25,242 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.