Irregulal plural

1.

2.

Some nouns are the same in both singular and plural form
ox
oxen

3.

mouse
mice

4.

Some nouns are the same in both singular and plural form
sheep
sheep

5.

Some nouns are the same in both singular and plural form
goos
gees

6.

Some nouns are the same in both singular and plural form
fish
fish

7.

Some nouns are the same in both singular and plural form
deer
deer