Which to use
“sei” is a num and “Sie” is a pronoun - they look or sound alike but fill different roles in a sentence.
- #48,072
- “sei” frequency rank
- #33,843
- “Sie” frequency rank
- 81915
- confusion score
Side-by-Side Comparison
| Feature | sei | Sie |
|---|---|---|
| Definition | Seis. | Usted. |
Where the eye mixes sei and Sie
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. sei and Sie follow the identical consonant-vowel pattern (CVV). Same shape at a glance is often the real trap, independent of shared letters.
Why the eye confuses sei with Sie
These two trip readers on the page rather than in the ear: sei is /s̺ej/ while Sie is [ziː]. Spoken aloud the problem disappears. In writing it persists, because they differ only by swapping two adjacent letters (ei ↔ ie) - a transposition the eye reads straight past, and the parts of speech differ too (num vs pronoun), which is usually the fastest check. Our composite confusion score for this pair is 81915, derived from the frequency rank of both members and their visual similarity.
sei is recorded at frequency rank #48,072, classified as anum, pronounced /s̺ej/. Sie is at rank #33,843, tagged as apron, pronounced [ziː].
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 81915, this pair ranks #9,834 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.
Orthographic DNA of sei vs Sie
Shared letters: eis. Private to "sei": -. Private to "Sie": -.
"sei" · 3 letters · shape CVV · "Sie" · 3 letters · shape CVV
Frequently Asked Questions
Is swapping "sei" for "Sie" ever safe?
Which is more common, "sei" or "Sie"?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "sei" 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 #9,834 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "sei" and "Sie" also get mixed up with nearby pairs, the highest-scored neighbour is "sei vs stem". Nearby pair
Confusion rank #9,834 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.