There are several nouns in english which

have irregular plural forms.  That means :

they do not take the /s/ to make them

plural nouns such as :

10 books 7 days 12 months 20 pens

Some examples of irregular plural nouns:

singular                       plural

woman                                    women

man                                         men  

child                                        children

tooth                                       teeth

foot                                         feet

mouse                                     mice

louse                                       lice                                                    

Looking at the pictures below you can see

two other irregular plural nouns . Do you

remember these animals' names?

How about making  your own list of different

irregular plural nouns ,after looking them up

 in the dictionary ? It may be useful later on.