

Этот документ нельзя сгибать пополам.
This document must not be folded in half.
Он почти не сгибает колени, когда бегает.
He hardly bends his knees when he runs.
Пожалуйста, не сгибай фотографии в конверте.
Please don't bend the photos in the envelope.
"сгибать" is in the lesson "Verbs 10" (Level 22), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.