Answers

2015-08-31T22:18:06+08:00
Noun that's change from their singular form to become plural , their spelling changes in a different way to to regular words where cat, dog and book are made plural by adding a letter 's' - cats, dogs, books etc. But it would be incorrect English to add an 's' or 'es' to 'irregular' words.
 example:
mouse changes to mice 
0