Present continuous (I am doing)

UNIT 1. Present continuous (I am doing)
A. Study this example situation:
Ann is in her car. She is on her way to work.
She is driving to work.
This means: she is driving now, at the time of speaking. The action is not finished.
Am/is/are ~ing is the present continuous:
I am(= I'm) driving
he/she/it is(he's etc.) working
we/you/they are(we're etc.) doing etc.

C. We use the present continuous when we talk about things happening in a period around now (for example, today/this week/this evening etc.):
* 'You're working hard today.' 'Yes, I have a lot to do.' (not 'you work hard today')
* 'Is Susan working this week?' 'No, she's on holiday.'
We use the present continuous when we talk about changes happening around now:
* The population of the world is rising very fast. (not 'rises')
* Is your English getting better? (not 'does your English get better')