

This is the main street in town.
[ˈðɪs ˈɪz ðə ˈmeɪn ˈstrit ˈɪn ˈtaʊn.]
What's the main problem with your car?
[ˈwɑts ðə ˈmeɪn ˈprɑbləm ˈwɪθ jər ˈkɑr?]
The main entrance is closed today.
[ðə ˈmeɪn ˈɛntrəns ˈɪz ˈkloʊzd təˈdeɪ.]
"main" is in the lesson "Adjectives 6" (Level 40), along with 10 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.