

Не надо сосать палец, это вредно.
Don't suck your thumb, it's bad for you.
Дочка сосёт леденец уже полчаса.
My daughter has been sucking on a lollipop for half an hour.
В детстве я часто сосал мятные конфеты.
As a child, I often sucked on mints.
"сосать" is in the lesson "Eating" (Level 20), along with 9 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.