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Spoken and written English do not have different grammars, but the shared English grammar is used differently on the two channels. For the benefit of those who want to acquire good, all-round communicative competence we will therefore indicate in this book many such differences in the use of English grammar. So,
teach teaching spoken language to a foreigner is wrong because he may get confused.
spoken and written languages are essential, because both are types of language in use.
written and spoken languages are the same thing.
spoken language is wrong because it does not follow grammar.
study a descriptive grammar is enough.