Non progressive verbs

Some verbs are not normally used in the progressive (also known as the 'continuous') forms.

1. Verbs describing mental states: believe, doubt, expect, feel (=think or have an opinion), forget, guess, imagine, intend, know, mean, perceive, realize, recall, recognize, recollect, regard, remember, see (=understand), suppose, think (=be of the opinion, have an opinion), trust, understand.

The Continuous Forms

The Continuous Tenses: grammar rules, usage and examples.
present continuous 
past continuous
future continuous

The Present Continuous

The Formation of the Present Continuous

auxiliary verb to be (is/are) + Participle I 

(the present tense of the verb to be + the present participle of the main verb.)

Affirmative	Interrogative	Negative
I am walking. He is walking. She is walking. It is walking. We are walking. You are walking. They are walking.	Am I walking? Is he walking? Is she walking? Is it walking? Are we walking? Are you walking? Are they walking?	I am not walking. He is not walking. She is not walking. It is not walking. We are not walking. You are not walking. They are not walking.

The Present Continuous is used to denote:
1) an action going on at the present moment.

Key example: 
Children are going to school now.

For study: 
Look out of the window in the morning!

1. Cars are running along the street.
2. People are hurrying to work. 
3. Children are going to school.
4. Some are crossing the street.
5. A milkmaid is pouring milk into a jug. 
6. A man is selling newspapers. 
7. A woman is approaching the grocery.