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.

Most of us don’t think twice about plural forms — we just kind of know them. But when you actually have to spell them out, things get trickier. Is it “knifes” or “knives”? “Cactuses” or “cacti”?

Take our English quiz and find out if you know the plurals of these tricky words. Is the word 'sheep' singular or plural? What is the plural form of 'information'? While you can derive the plurals of ...

Is it 'spoonsful' or 'spoonfuls'? 'Fish' or 'fishes'? Take our singular-plural English quiz and see how many you manage to get right. Answers are provided upon submission of results on each page and ...