Can You Find the Plural of These Words?

To find the plural of any word, just add an "s"...right? Not so fast! Before you get grilled by the grammar cops, can you prove you have the chops? See if you can spell these tough words in plural form - try the quiz now!
START
What is the plural of the word "deer"?
What is the plural of the word "crisis"?
What is the plural of the word "oasis"?
What is the plural of the word "criterion"?
What is the plural of the word "ox" (animal) ?
What is the plural of the word "knife"?
What is the plural of the word "emphasis"?
What is the plural of the word "radius"?
What is the plural of the word "roof"?
What is the plural of the word "goose"?
What is the plural of the word "moose"?
If the grammar police calls, tell them you're busy bettering your grammar!
Not bad! You're clearly on the path to greater grammar awareness.
Excellent! You've definitely got your grammar groove on.
Congratulations, you aced the test! Maybe you're a grammar teacher or maybe not, but it seems there's no pesky plural that escape your expert radar.