Every adult should be able to get a 100% on this plurals quiz, can you pass the test? It's time to put your knowledge of plurals to the ultimate test. Do you think you're up to the challenge?

Question 1/12

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What is the plural of "potato?"
Potatos
Potatoes
Potato's
Question 2/12

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What is the plural of "knife?"
Knives
Knifes
Knive
Question 3/12

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What is the plural of "crisis?"
Crisis'
Crises
Criseses
Question 4/12

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What is the plural of "passerby?"
Passersby
Passerbys
Passerbies
Question 5/12

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What is the plural of "penny?"
Penni
Penny's
Pennies
Question 6/12

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What is the plural of "calf?"
Calfs
Calves
Cifes
Question 7/12

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What is the plural of "index?"
Indexes
Indices
Indexs
Question 8/12

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What is the plural of "matrix?"
Matrices
Matrixes
Matrix's
Question 9/12

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What is the plural of "ox?"
Oxes
Ox's
Oxen
Question 10/12

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What is the plural of "radius?"
Radii
Radiuses
Radius's
Question 11/12

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What is the plural of "serum?"
Sera
Serums
Seras
Question 12/12

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What is the plural of "formula?"
Formuli
Formulae
Formulas
You might not be an expert on plurals just yet, but you're showing some serious promise! You've got a strong foundational knowledge of both grammar and language. We know you'll be an expert in no time!
C+, Plural Promise

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Right!
You are truly plural proficient! Plurals can be confusing to some, but not to you. You know your plurals like only a true English grammar aficionado can. Keep up the good work and never stop learning!
B+, Plural Proficient

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Right!
You are plural profound! When it comes to plurals, many Americans are left scratching their heads in confusion. Not you! You proved that it is possible to know your plurals like a true English ace. Well done!
A+, Plural Profound

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Right!
1

What is the plural of "potato?"
Potatos
Potatoes
Potato's
2

What is the plural of "knife?"
Knives
Knifes
Knive
3

What is the plural of "crisis?"
Crisis'
Crises
Criseses
4

What is the plural of "passerby?"
Passersby
Passerbys
Passerbies
5

What is the plural of "penny?"
Penni
Penny's
Pennies
6

What is the plural of "calf?"
Calfs
Calves
Cifes
7

What is the plural of "index?"
Indexes
Indices
Indexs
8

What is the plural of "matrix?"
Matrices
Matrixes
Matrix's
9

What is the plural of "ox?"
Oxes
Ox's
Oxen
10

What is the plural of "radius?"
Radii
Radiuses
Radius's
11

What is the plural of "serum?"
Sera
Serums
Seras
12

What is the plural of "formula?"
Formuli
Formulae
Formulas