• We use the present perfect continuous to talk about actions or situations that started in the past and are still continuing now :

We have been waiting for about an hour.

Kaan's has been living with his family

• We often use for or since to aswer the question How long ? :

We have been waiting for about an hour.

I have been working since three o'clock

• We can also use the present perfect continuous if the action or situation finishes at the time of speaking :

I have been waiting in this queue for an hour! (... but now I have reached the ticket office. )

Clive's been driving all morning. (... but now he's arrived. )

• We use the present perfect, NOT the present perfect continuous, when we say how many times we have done something, or how much we have done :

X I have been washing the car twice this week.

✔ I have washed the car twice this week.

X We have been having three lessons so far.

✔ We have had three lessons so far.

• We don't usually use the present perfect continuous with always, already and yet :

X I haven't been washing the car yet.

✔ We haven't washed the car yet.