All English nouns are either singular or plural. Most words form the plural by adding an -s to the end of the singular form:

month–>months

visa–>visas

airport–>airports

Other words, already referring to more than one person or thing, do not normally add an -s.

–the people, the fish, the mice, etc.

Examples of Singular and Plural of Nouns

• Good afternoon. May I see your passport please?
• Do you have any valuables or alcohol to declare?
• You can take a cab, bus, limo, or hotel shuttle.