A forma afirmativa do Present Perfect Continuous é feita com o Presente Simples do verbo to have (have / has) + Presente Perfeito do verbo to be + o gerúndio do verbo principal. Exemplos:

I have been studying for nine years in that school.
She has been working there since 2010.
My grandfather has been living here for 20 years.
You have been talking on the phone since she got home.
He has been playing guitar for two hours.