In the simple formation, the participle is the lexical verb (Lesson 3); in the continuous formation, the participle is been, with the -ing form of the lexical verb after it.
He has worked very hard this term.
The meeting has not started yet.
I have rented a car for two weeks.
They haven't fixed the car yet.
NOTICE: For spelling problems with the -ing form of the verb, look at Lesson 92.
I have been learning English for four years.
He has not been feeling very well lately.
It's been raining non-stop for days.
Have you been working hard recently?
What's she been doing?
Why has it been raining so much?
NOTICE: Lesson 25 tells you about the use of present perfect.