Don't drop the cup. It will break. The passive sounds weird because there is no "agent" that performs the breaking.
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rpshsometimes, the 'agent' can be omitted, isn't it? I mean in my instance, the 'agent' is the guy who holds the cup."Don't drop the cup. It will be broken by you" is very odd, and would not be assumed. Other agents may be possible; for example, "Don't drop the cup. It will be broken by the impact" is valid, but it would seem unnecessary in most situations. An
rpshI mean in my instance, the 'agent' is the guy who holds the cup.Nope. If the guy just lets it fall, it's the cold hard ground that does the business of breaking the cup.