Seninle gidememem üzücüdür. - It is regrettable that I can't go with you.
Seninle gidememem üzücüdür.
It is regrettable that I can't go with you.
Çok üzücü olduğunu düşünüyorum. - I think that's very regrettable.
Çok üzücü olduğunu düşünüyorum.
I think that's very regrettable.
It was regrettable that the teacher made the class retake the test when he was wrong about the answers.