Most English verbs have two simple present forms. The main form...

and the third person singular form which is the main form with an s sound added to the end.

When a verb ends in a y,the y becomes i and and an es is added.

The simple present tense is used to describe habitual actions or characteristics.

When the subject of a sentence is leftout, the present simple becomes a command.

The main form of the 'to be' verb is be.