Present Continuous Tense

This tense is used for the following purpose:

(a) To express an action that is going on at the time of speaking.
For example:

1. She is knitting socks.
2. You are deceiving your friend.
3. I am writing a letter.

(b) As a substitute for the immediate future.
For example:

1. My brother is reaching here in an hour.
2. She is leaving this place tomorrow.
3. You are proceeding to America next month.