Singular and Plural

Make a singular noun to be a plural noun, add s :

Example:
- The word ends in ch, sh, x, s --> add es.
Such as : church - churches

- The word ends in y, --> change to ies.
Such as : baby - babies

- The common irregular plurals.
Such as : women, men, teeth, feet etc.

Reference: Grammar Practice for Pre-Intermediate Students.