

We'll go for a walk unless it rains.
[ˈwil ˈɡoʊ fər ə ˈwɔk ənˈlɛs ɪt ˈreɪnz.]
Don't call me unless it's really important.
[ˈdoʊnt ˈkɔl ˈmi ənˈlɛs ˈɪts ˈriəli ɪmˈpɔrtn̩t.]
I can't help you unless you tell me the truth.
[aɪ ˈkænt ˈhɛlp ˈju ənˈlɛs jə ˈtɛl ˈmi ðə ˈtruθ.]
"unless" is in the lesson "Conjunctions" (Level 32), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,375 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.