Singular (-f, -fe)	Plural (-ves)
knive	knives
life	lives
wife	wives
calf	calves
leaf	leaves

Singular (-o)	Plural (-oes)
potato	potatoes
tomato	tomatoes
hero	heroes
torpedo	torpedoes
veto	vetoes

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from Grammarly Blog
https://www.grammarly.com/blog/32382-2/