

Никто не знает ответ.
No one knows the answer.
Дома никто не отвечает.
Nobody is answering at home.
Почему никто не пришёл?
Why did no one come?
"никто" is in the lesson "Pronouns" (Level 30), along with 17 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.