"These are not flies."
Translation:Это не мухи.
November 13, 2015
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[deactivated user]
Please see a guide to using э́то by olimo: https://www.duolingo.com/comment/11536858
[deactivated user]
Genitive is not used in ‘X is not Y’-type sentences.
It’s used for direct objects when the verb is negated («я не ви́жу мух» ‘I don’t see flies’). But Y in ‘X is Y’ sentences is not considered a direct object in Russian (it’s never used in the accusative).