Present continuous

The present continuous tense is one of the continuous tenses in English. (Continuous tenses are: present continuous, past continuous, and future continuous.)
The present continuous (also called "present progressive") tense mainly describes actions that are in progress at the time of speaking.
Forms.
Affirmative sentences.
Affirmative sentences in the present continuous are formed using verb be (am / is / are) + base verb-ing.
The short forms 'm, 's, 're can be used in informal situations and in speech.
Negative sentences.
Negative sentences are formed by adding not (or the short form n't) to the verb be.
Questions.
Yes / No question are formed using Verb be (Am / Is /Are) + subject + base verb-ing.
Wh-questions begin with one of the wh-question words.
Uses.
Present continuous verbs are used to describe the following situations.
Repeated actions.
Adverbs like always are used in this structure to imply that the speaker is irritated or annoyed by the action, or that the action was unplanned or unexpected.
Non-continuous verbs.
Non-continuous (or state verbs) are a group of verbs that describe state rather than action. They are not used in the continuous form. Instead, the present simple tense is used instead. 
Some verbs can be used as state verbs and action (or dynamic) verbs, but with different meanings.