Some dialects express the plural form of a word by adding an "s" or "es" at the end of the word. For example, in Standard English, the plural of "cat" is "cats" and the plural of "dog" is "dogs." Other dialects may use different methods to indicate the plural form, such as changing the vowel sound or adding a different suffix. It is important to note that the way in which the plural form is expressed can vary greatly between different dialects and languages.