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То же самое есть в английском: must не всегда должен/обязан. He must've studied for years. His Russian is highly impressive.[/quote]

Whose Russian is highly impressive?[/quote]
Not yours,...

Again everything seems correct.
But again I warn you :lol: I hope you understand that given translations are only correct in certain context while in other context they will be wrong.

Everything seems to be right there.
But it's better to work with phrases in context.