German · Pronunciation Guide
dee TUER. A long front-rounded ü with the r melting into a vowel behind it.
There is one vowel here and it is long. The plural Türen adds a syllabic-n ending, which puts the r in front of a vowel and turns it back into a real scraped consonant — so the singular ends softly on a vowel and the plural has an audible r in the middle. Same letter, two behaviours.
Listen: die Tür
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Mach bitte die Tür zu.
Close the door, please.
Listen: Mach bitte die Tür zu.
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Mach bitte die Tür zu splits zumachen, sending the prefix zu to the very end of the command. Mach is the bare du-imperative with the throaty ach-laut, so the sentence starts with a back-of-throat scrape and ends on a small stranded prefix.
The ür sequence is one of the hardest in German for English speakers, because the obvious substitutes — the vowel of tour or the vowel of turn — are both wrong in different ways. Build the ü on its own from a long 'ee' with rounding, then add the vocalised r behind it rather than merging the two from the start.