THE PRESENT CONTINUOUS IS USED:

To describe an action that is going on at this moment:

• She is reading an interesting story.
• She is discussing about a trip with her friends.

To describe an action that is going on during this period of time or a trend:

• Are you still working living in the same house?
• More and more people are becoming vegetarian.

To describe an action or event in the future, which has already been planned or prepared:

• They're going on holiday next week.
• I'm meeting my best friend tonight.
• Are your friends visiting here next winter?

To describe a temporary event or situation:

• He usually plays the drums, but he's playing bass guitar tonight.
• The weather forecast was good, but it's raining at the moment.
• He likes coffee early morning but nowadays he is drinking tea.