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Не могу достаточно подчеркивать свое уважение к грамматике Terrence Wade, A Comprehensive Russian Grammar. Внизу выдержка из этой книги.

Adversative conjunctions

1) A 'and, but, whereas'

i....

Think of a as meaning but/whereas. In both you have an opposition of things or actions, whereas in и you do not.

Secondly, very often Russians begin a question with A, which you do not translate...