No, there is no rule in Uno that requires you to say "uno" when you have one card left. It is a common practice to announce it as a courtesy to other players, but it is not mandatory.
The card game where you have to say "uno" when you have one card left is called Uno.
Yes, in the game of Uno, you can say "Uno" when you have only one card left.
Yes, in the card game Uno, it is customary to say "Uno" when you have one card left in your hand.
You say "uno" in a game of Uno when you have only one card left in your hand.
You say "uno" in the game of Uno when you have only one card left in your hand.
You say "uno out" when you have one card left in your hand and you are about to play it in a game of Uno.
No, you do not have to say "Uno" out loud when you have only one card left in the game of Uno, but it is a common rule in the game to announce it to the other players.
You can say "uno" when you have one card left in your hand during a card game.
Before playing your last card in a game of Uno, you say "Uno" to indicate that you have only one card left.
Yes, in the card game Uno, you have to say "Uno" when you have one card left in your hand in order to win the game.
You say "uno" when you have only one card left in your hand during the card game.
You have to say "uno" when you have only one card left in your hand while playing the card game.