Portuguese (Brazil) · Pronunciation Guide
SEH-tchee. The first e is wide open like "bed," and the ending is "tchee," not "teh."
Ending in -e means the default rule stresses the second-to-last syllable, so "se-" takes the weight and nothing needs marking. That leaves the final syllable unstressed, which is precisely the condition that raises its e to i and triggers the t-palatalization — the stress rule and the sound change are directly linked.
Listen: sete
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A semana tem sete dias.
There are seven days in a week.
Listen: A semana tem sete dias.
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"A semana tem sete dias" gives you the palatalization twice: "sete" ends in "tchee" and "dias" begins with "djee." Between them sits "tem," a nasal "teyng" — and notice its t stays hard, because the vowel after it is a nasal e, not an i. The contrast in one short sentence is a good ear-training exercise.
Beginners say "SET-eh" or "SEH-tay," keeping a hard t and a full e at the end. Both are wrong for Brazil: it's "SEH-tchee." The open first vowel also gets missed — English speakers tend to substitute a closed "ay" and produce "SAY-tchee," which shifts it toward a different vowel quality than natives use.