You can use the present perfect continuous for action repeated over a period of time:
.Debbie is a very good tennis player. She's been playing since she was eight.
.Every morning they meet in the same cafe. They've been going there for years.

You can also say there is sure/certain/likely to be something(see also Unit 64E):
There is sure to be a flight to Paris this evening.
We use it in sentences like this:
It's dangerous to walk in the road.(It=to walk in the road)

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.

to the student
This book is for students who want help with English grammar. It is written for you to use without a teacher.
The book will be useful for you if you are not sure of the answers to questions like these:
* What is the difference between I did and I have done?
* When do we use will for the future?
* What is the structure after I wish?
* When do we say used to do and when do we say used to doing?
* When do we use the?
* What is the difference between like and as?

study this example situations:
Tom is looking for his key. He can't find it.
He has lost his key.(present perfect)
This means that he doesn't have his key now.

10 minutes later:
Now Tom has found his key. He has it now.
Has he lost his key? (present perfect)
No, he hasnt. He has found it.
Did he lose his key?(past simple)
Yes, he did.
He lost his key(past simple)
but now he has found it.(present prefect)

The present perfect is a present tense. It always tells us something about now. 'Tom has lose his key'= he doesn't have his key now.

The past simple tells us only about the past.If somebody syaw 'Tom lost his key', we don't know whether he has it now or not. We only know that he lost it at some time in the past.

English Grammar in Use was written as a self-study grammar book but teachers may also find it useful as additional course material in cases where further work on grammar is necessary.
The book will probably be most useful at middle-and upper- intermediate levels and can serve both as a basis for revision and as a means for practising new structures. It will also be useful for some more advanced students who have problems with grammar and need a book for reference and practice.