the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.
it is formed using: person + verb to be (am/is/are) +verb + - ing form
example: i am studying at this moment .
in addition, the present continuous is also used in order to express things that will or will not happen in the near future.
example: i am having dinner with some friends tonight.
the speaker sometimes uses it to express that an action is repeated and it causes irritation on the part of the speaker
example: my sister is constantly complaining about everything.