what is the rule of present perfect continuous

Dear Student,

In present perfect continuous tense, the actions, events or habits that began in the past and still continuing in the present are indicated.

Example: I have been waiting for you. (Present perfect continuous tense)

It is formed by:

I/we/they/you    have  been     + (-ing) form of the verb

he/she/it   has  been   + (-ing) form of the verb