Level B1
Present Perfect Continuous
The wall is half painted. She has been painting it.
Look: The wall is half painted. She has been painting it. The activity began before now; has been painting is a three-word form.
Forms
The wall is half painted. She has been painting it.— has been plus the -ing form for an activity that began before nowThe letter is unfinished. She has been writing it.— the same three words with another verbThe room is half clean. She has been cleaning it.— he, she and it take has
A common mistake
Wrong: He has living there.
Right: He has been living there.
So many people say He has living there, but been is missing. We say: He has been living there.
More examples
The meal is half cooked. She has been cooking it.
Cooking works the same way: The meal is half cooked. She has been cooking it.
She has been watching the door. Her work is unfinished.
And so does watching: She has been watching the door. Her work is unfinished.