The present continuous tense (also called the present progressive tense) describes actions that are happening right now or are continuing (they have not stopped).

I am brushing my teeth. 

I am going to work. 

I am drinking coffee. 

What is the difference between "I brush my teeth" and "I am brushing my teeth"? 

I brush my teeth. When? Morning? Evening?

I am brushing my teeth. When? Now.

I go to work? When? Monday? Tuesday? Every day?

I am going to work? When? Now.

To form the present continuous tense:

present continuous tense = present tense of verb to be + base form of the verb + ing

Singular

First Person - I am eating. 

Second Person - You are eating. 

Third Person - He, She, It is eating.  

Plural

First Person - We are eating. 

Second Person - You are eating. 

Third Person - They are eating.