None! It does not exist. You never learn a language by studying grammar. Grammar books should only be used as a reference, just like a dictionary. You use a dictionary to look up the meaning of a word, that is to improve your vocabulary, and you should use a grammar book to help you to understand the pattern of a certain phrase or sentence.
It is completely and utterly pointless and boring to learn English by studying grammar. Just look at many Asian and South American countries where many schools still focus on grammar and you will see that despite years and years of learning English, the students still can’t speak fluent and confident English. It does not work.
Grammar is extremely important. I don’t want you to go ahead and think “that guy’s telling us not to study grammar just because he does pronunciation”! It’s not that you dipstick…
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