Present Continuous (1)

A

Yume 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.
I am driving
He/sheit is working
We/you/they are doing, etc.

B

I am doing something = I’m in the middle of doing something; I’ve started doing it and I haven’t finished yet. Often the action is happening at the time of speaking :

Please don’t make so much noise. I’m working. (not I work)
“Where’s Yume?” “She’s taking a bath.” (not She takes a bath)
Let’s go out now. It isn’t raining anymore. (not It doesn’t rain)
(at a party) Hello, Yume. Are you enjoying the party? (not Do you enjoy)
I’m tire. I’m going to bed now. Good night!

However, the action is not necessarily happening at the time of speaking. Such as :

I’m reading an interesting book at the moment.
I will lend it to you when I have finished it.

The man 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.

For example :

Maria wants to work in Italy, so she is studying Italian. (but perhaps she isn’t studying Italian exactly at the time of speaking)
Some friends of mine are building their won house.

C

We use the present continuous when we talk about things happening in a period around now (for instance, today / this week / tonight, etc)