Present Perfect Continuous Tense

I have been singing

How do we make the Present Perfect Continuous Tense?

The structure of the present perfect continuous tense is:

subject+auxiliary verb+auxiliary verb+main verb
  have
has
 been base + ing

Here are some examples of the present perfect continuous tense:

 subjectauxiliary verb auxiliary verbmain verb 
+Ihave beenwaitingfor one hour.
+Youhave beentalkingtoo much.
-Ithasnotbeenraining. 
-Wehavenotbeenplayingfootball.
?Haveyou beenseeingher?
?Havethey beendoingtheir homework?

Contractions

When we use the present perfect continuous tense in speaking, we often contract the subject and the first auxiliary. We also sometimes do this in informal writing.

I have beenI've been
You have beenYou've been
He has been
She has been
It has been
John has been
The car has been
He's been
She's been
It's been
John's been
The car's been
We have beenWe've been
They have beenThey've been

Here are some examples:

How do we use the Present Perfect Continuous Tense?

This tense is called the present perfect continuous tense. There is usually a connection with the present or now. There are basically two uses for the present perfect continuous tense:

1. An action that has just stopped or recently stopped

We use the present perfect continuous tense to talk about an action that started in the past and stopped recently. There is usually a result now.

I'm tired because I've been running.
pastpresentfuture

!!!
Recent action.Result now. 

2. An action continuing up to now

We use the present perfect continuous tense to talk about an action that started in the past and is continuing now. This is often used with for or since.

I have been reading for 2 hours.
pastpresentfuture

Action started in past.Action is continuing now. 

For and Since with Present Perfect Continuous Tense

We often use for and since with the present perfect tense.

forsince
a period of timea point in past time

x
20 minutes6.15pm
three daysMonday
6 monthsJanuary
4 years1994
2 centuries1800
a long timeI left school
everthe beginning of time
etcetc

Here are some examples: