

Look at the blackboard, please.
[ˈlʊk ət ðə ˈblækˌbɔrd, ˈpliz.]
The teacher writes on the blackboard.
[ðə ˈtitʃər ˈraɪts ˈɔn ðə ˈblækˌbɔrd.]
I can't see the blackboard.
[aɪ ˈkænt ˈsi ðə ˈblækˌbɔrd.]
"blackboard" is in the lesson "Classroom" (Level 9), 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.