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Grammar... let it go! The English grammar is one of the simplest, with no comparison to Russian. honestly honestly.
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My teacher of English (not in school, on dop courses), a former translator, said that English is not mathematics, 2x2 can be both 3, and 5. Especially in schools they learn Queen’s English, the straight correct-right, which is spoken almost only in the queen’s palace. Others make suggestions as they want. Of course, following some basic rules to at least understand something can be.