Irregular plurals in English don't follow the usual rule of adding "-s" or "-es"

 

Irregular plurals in English don't follow the usual rule of adding "-s" or "-es" to make a noun plural. Here are some common types:

1. Words that change completely:

• Man → Men
• Woman → Women
• Child → Children
• Tooth → Teeth
• Foot → Feet
• Mouse → Mice
• Goose → Geese

2. Words that stay the same in singular and plural:

• Sheep → Sheep
• Deer → Deer
• Fish → Fish (sometimes "fishes" is used when referring to different species)
• Moose → Moose

3. Words ending in "-f" or "-fe" that change to "-ves":

• Leaf → Leaves
• Wolf → Wolves
• Knife → Knives
• Wife → Wives
• Life → Lives

4. Words ending in "-us" that change to "-i":

• Cactus → Cacti
• Fungus → Fungi
• Nucleus → Nuclei
• Radius → Radii

5. Words ending in "-is" that change to "-es":

• Analysis → Analyses
• Thesis → Theses
• Crisis → Crises
• Diagnosis → Diagnoses

6. Words ending in "-on" that change to "-a":

• Phenomenon → Phenomena
• Criterion → Criteria