Your explanation is very unclear. If this symmetry you're talking about refers to antonyms, for example "It's GOOD" and "It's BAD", then certainly that is a type of symmetry. Also the word order in some simple sentences can be reversed.
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bepleasedThe snow melted in the sunshine / The snow was melted by the sunshine.So you're compari
An ergative verb is a verb that can be either transitive or intransitive, and whose subject when intransitive corresponds to its direct object when transitive.Your example of "melted" is a good one, so