The “S" form

Introduction
The "S" form is the form of a verb that ends with "s" or "ies".Many people who learn English as a second language mistake the "s"form for a plural verb. This is a misconception.A plural verb and a singular verb have the same forms except the present simple  tense form that has a third person singular subject.However,it is important to note that the verb "be" has unique characteristics;it has clear singular and plural forms.

As you have read above, the "s"form is not a plural verb.It is a singular verb in the present simple tense. This form is used only with third person singular subjects.Knowing this unique function helps solve the problem of subject-verb agreements.

Note that the "s"form agrees with only the 3rd person singular subjects and the pronouns which substitute these.

Look at the following examples:

1. Ali walks to school.2. He walks to school everyday.

3.Sheikh writes in his book.4He writes in it everyday.

5.My cat sleeps in the sofa.6.It sleeps in the sofa when there are no visitors.

The words-"Ali","Sheikh",and "My dog",are 3rd persom singular subjects,and they are replaced by the pronouns "He",and "It"in the adjoining sentences.

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