IntroductionIf you have one dog, you say, "I have a dog." If you have two, you say, "I have two dogs."dog → dogs, cat → cats.

Lots of languages have distinct plural forms for you. When talking to more than one person, the French use vous; the Italians, voi; the Spanish, ustedes; and the Germans, ihr. Wouldn't it be useful if ...

One fish, two fish, red fish, blue fish, goes the Dr. Seuss children’s story. Why isn’t it two fishes? You may think, “Ok, it’s hard to count fish so we group them all together. No problem.” Let’s ...

Think you know your plurals? From everyday words like "tomato" to tricky Latin and Greek forms like "nucleus" and "appendix," this 25-question quiz will put your grammar skills to the ultimate test.