• Most nouns have distinctive SINGULAR and PLURAL forms. The plural of regular nouns is formed by adding -s to the singular:  

           Examples: 

But some nouns form the irregular plurals  in a different way, those are irregular nouns:

Some nouns form the irregular plurals by adding  -es

Some others form the irregular plurals  adding -ies

Another group changes -f/fe into -ves

• The distinction between singular and plural is known as NUMBER CONTRAST
• Sometimes we use a plural noun for one thing that has two parts. For instance:

         scissors, glasses, jeans, trousers, shorts, pants (two parts), so they take a plural verb:

          My glasses  are very old

           A pair of + these words can also be used:

          Those are nice trousers  or  that's a nice pair of trousers.

• Some words ending in -s can be singular or plural. For instance:

         Some nouns end in -ics but are not always plural. For instance: 

Although ending in s, News is not plural: What time is the news on the radio.

• We always use a plural verb with politice and people:The police have arrested a thief, these people are friends of mine.

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