Present Perfect continuous ( I have been doing )

A / It has been raining. Study this example situation;
   " Is it raining? " " No, but the ground is wet. It has been raining "
 
     Form
Positive
   Subject + have/has + been + verb ( ing ).
Negative
    Subject + have/has + not + been + verb ( ing ).
  Question
    Have/has + Subject + been + verb ( ing )?

    Using
   We use Present Perfect for an activity that has recently stopped or just stopped.
There is a connection with now.
Ex; Paul is very tired. He has been working very hard. ( He tired now )

B / It has been raining for two hours. Study this example situation;

It is raining now. It began raining two hours ago and it is still raining.
 
How long has it been raining ?
It has beeb raining for two hours.