If heads always turns up when a coin is flipped three times, you can win $ 1.
Is the sentence grammatically correct?
In the sentence, 'heads' is an uncountable noun.
The use of "heads" is OK in itself, but the "always" phrasing is not very good or clear, in my opinion. Also, why "you can win" and not "you win"? It sounds as if there is some catch.
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The use of "heads" is OK in itself, but the "always" phrasing is not very good or clear, in my opinion. Also, why "you can win" and not "you win"? It sounds as if there is some catch. Also, it should be "$1" not "$ 1".