Study this example situation:
Sarah 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.)
They are playing football now.
She is drinking coffee.
He is going to the library.
'Where's Mark?' 'He's having a shower.' (not He has a shower)
Let's go out now. lt isn't raining any more. (not lt doesn't rain)
(at a party) Hi, jane. Are you enjoying the party? (not Do you enjoy)
What's all that noise? What's going on? (=What's happening?)
For example: Steve is talking to a friend on the phone. He says:
(I’m reading a realy good book at the moment.it’s about a man who…)
(He is not reading the book at the time of speaking.He means that he has started it, but has not finished it yet.He is in the middle of reading it.)
A: You're working hard today. (not You work hard today)
B: Yes, I have a lot to do.
C: The company I work for isn't doing so well this year.
get, change, become, increase, rise, fall, grow, improve, begin, start,
Is your English getting better? (not Does your English get better)
The population of the world is increasing very fast. (not increases)
At first I didn't like my job, but I'm beginning to enj oy it now. (not I begin)