Portuguese (Portugal) · Pronunciation Guide
Say 'EESH-too', with a soft 'sh' in the middle before the 't', and a short 'oo' at the end.
Stress on the first syllable; the 's' before the consonant 't' becomes 'sh' [ʃ], and the final 'o' reduces to a short [u].
Listen: isto
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O que é isto?
What is this?
Listen: O que é isto?
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'O que é isto?' uses the neuter demonstrative 'isto' for an unspecified or unidentified object, unlike 'este/esta' which require knowing the noun's gender. This makes 'isto' especially handy early on, when you don't yet know the gender of whatever you're pointing at.
As with 'este', the key mistake is treating the internal 's' as a plain English 's' rather than softening it to 'sh' before the 't'. Learners exposed mainly to Brazilian Portuguese may also expect the following dental 't' sound to be unaffected — which is correct here, since 't' before 'o' never palatalizes in either dialect, unlike 't' before 'i/e'.