

В неделе семь дней.
There are seven days in a week.
Магазин открывается в семь.
The store opens at seven.
Почему тут семь тарелок?
Why are there seven plates here?
"семь" is in the lesson "Numbers" (Level 3), along with 19 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.