How do you mark mines in Minesweeper?

How do you mark mines in Minesweeper? I mark each mine by a single right-click over them. On the top right corner, I had three squares that I doubt them to be mine. So I decided to mark these mines as questionable with question mark Minesweeper flag. In order to mark a Minesweeper square with question mark, right-click on the square twice.

I mark each mine by a single right-click over them. On the top right corner, I had three squares that I doubt them to be mine. So I decided to mark these mines as questionable with question mark Minesweeper flag. In order to mark a Minesweeper square with question mark, right-click on the square twice.
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