Portuguese (Portugal) · Pronunciation Guide
Say 'EE-soo' — a clear stressed 'ee' followed by a plain 's' sound and a short 'oo', with no 'sh' anywhere in the word.
Stress on the first syllable; because the double 's' sits between two vowels rather than at a syllable edge, it stays a plain, crisp 's' — this word has no 'sh' sound at all, unlike most other 's'-containing words on this list.
Listen: isso
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O que é isso?
What is that?
Listen: O que é isso?
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'O que é isso?' uses 'isso' for something near the listener rather than the speaker, completing the three-way demonstrative system alongside 'isto' (near the speaker) and 'aquilo' (far from both). It's an extremely common everyday question for pointing at or asking about something.
After learning that EP consistently turns 's' into 'sh' at word edges, learners often over-apply that rule here too and say 'EE-shoo'. But double 's' between vowels is a spelling device that specifically keeps the sound a plain 's' — 'isso' should never have a 'sh' in it, in contrast to 'isto' right next to it on this list, which does.