Example sentences
1. I have painted the walls, look at all the colours!
2. I have been painting the walls, really sorry for the mess!
3. I have painted a bedroom three or four times.
4. Lately, I have been painting a lot of walls.
Focus on ... A - result/completion of the action
B - process/duration of the action
C - how many times the action has happened
D - temporary/incomplete action
Red is a present perfect simple/present perfect continuous
Green is a present perfect simple/present perfect continuous