• Present Perfect Continuous

• 
• Present perfect continuous is a tense that connects the past and the present (now).

  
  

  There are two main uses for present perfect continuous:

  1. Continuing actions 
  2. Recent actions with results in the present

  
  

  For present perfect continuous, use the present perfect* form of verb 'be' and a present participle.

  
  

  have/has been + present participle

  -I have been waiting all day.

  -She has been waiting all day.  
• Contractions: Form contractions with the subject and have/has in present perfect continuous.

  -I have been waiting all day. > I've been waiting all day.

  -She has been waiting all day. > She's been waiting all day.
• *Remember! Present perfect is have/has and a past participle.  The past participle of verb 'be' is been.

Source : Alison