

English grammar isn't very difficult.
[ˈɪŋɡlɪʃ ˈɡræmər ˈɪzn̩t ˈvɛri ˈdɪfɪkəlt.]
We have a grammar lesson on Monday.
[wi həv ə ˈɡræmər ˈlɛsn̩ ˈɔn ˈmənˌdeɪ.]
Do you have a good grammar book?
[ˈdu jə həv ə ˈɡʊd ˈɡræmər ˈbʊk?]
"grammar" is in the lesson "Lesson" (Level 37), along with 11 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.