

Мы пойдём в парк, если не будет дождя.
We'll go to the park unless it rains.
Если не успеешь к восьми, позвони мне.
If you don't make it by eight, call me.
Кто мне поможет, если не ты?
Who will help me if not you?
"если не" is in the lesson "Conjunctions" (Level 32), along with 13 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.