Yeah but remember that English is pretty irregular, so even though appending "-s" turns many words into their plural form there are many counterexamples. Like:

Yeah but remember that English is pretty irregular, so even though appending "-s" turns many words into their plural form there are many counterexamples. Like: - one fish, two fish - one sheep, two sheep - one child, two children - one mouse, two mice - one knife, two knives In this case many of us grew up using "lego" as the plural, so "legos" sounds to us a bit like "sheeps", "mouses" or "childs". Not a huge deal - nobody's losing any sleep over this, but it's definitely worth explaining why it sounds weird to some of us :)