What is the plural version of fly? The plural version of fly depends on meaning. For insect, plural is flies, spelled f l i e s, pronounced flyz, referring to multiple fly insects. For example, there are many flies in kitchen. For verb to fly meaning to move through air, plural present tense is fly, as in birds fly. For noun meaning zipper fly on pants, plural is flies as well, as in flies on pants. For verb meaning to be stylish, slang, plural is flies. So most common plural as insect is flies, changing y to ies. If referring to two different species of fly, you would still say flies, though in scientific context flies is used. For surname Fly, plural would be Flys. So answer is flies for insect, which is regular plural formation where y preceded by consonant changes to ies. So plural of fly is flies for almost all uses except verb where fly remains same in present plural form.
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