"He hears the duck."
Translation:Hij hoort de eend.
Hmmm, why does not hoor become hort rather than hoort? I feel like other verbs we've seen lose their double vowel.
If you change hoort to hort the pronunciation changes from a long-o to a short-o. In singular conjugations double vowels rarely change to a single vowel because of that.
Have a look at this website: http://www.heardutchhere.net/DutchPronunciation.html