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Help the dramatic film director give instructions to the crew about the actor playing a zombie. Select ALL the sentences that correctly express his strict condition.
The correct answers are The zombie will break character unless you give him a prop brain and The zombie will break character if you do not give him a prop brain.
The conjunction unless means exactly the same thing as if... not.
Therefore, "unless you give him" means "if you do not give him."
"Provided that" means "on the condition that," which logically reverses the intended warning here. Using "unless" with a negative verb ("unless you don't") creates a confusing double negative that means "if you give him," which is also incorrect.