Do you know the plural of these words?

Plural form is not just limited to "s" or "es". Do you know the plural form of these tough words? Come brush up on your grammar by taking this quiz!

You might not get all of these questions correct even if you're a native English speaker. Don't believe us? Give it a try.

• What is the plural of the word “Crisis”？

  Crisis

  Crises

  Crisises
• What is the plural of the word “Oasis”？

  Oases

  Oasea

  Oasises
• What is the plural of the word “Knife”？

  Kinfe

  Knifes

  Knives
• What is the plural of the word “Criterion”？

  Criterii

  Criteria

  Criteriae
• What is the plural of the word “Datum”？

  Datums

  Datii

  Data
• What is the plural of the word “Ox”？

  Oxes

  Oxen

  Ox
• What is the plural of the word “Nucleus”？

  Nuclii

  Nuclea

  Nuclei
• What is the plural of the word “Emphasis“？

  Emphases

  Emphasises

  Emphasesses
• What is the plural of the word “Larva”？

  Larvas

  Larvi

  Larvae
• What is the plural of the word “Phenomenon”？

  Phenomenas

  Phenomenons

  Phenomena
• What is the plural of the word “Radius”？

  Radiae

  Radii

  Radae
• What is the plural of the word “Deer”？

  Deor

  Deer

  Doer
• What is the plural of the word “Roof”？

  Roofs

  Roofes

  Rooves
• What is the plural of the word “Moose”？

  Mooses

  Moose

  Meese