

Это мой лучший друг.
This is my best friend.
У тебя есть друг в Москве?
Do you have a friend in Moscow?
Мой друг живёт рядом.
My friend lives nearby.
"друг" is in the lesson "Status" (Level 35), 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.