Present perfect progressive tense indicates an ongoing event begun in the past and continuing into the present.
- She has been looking tired lately.
- We have been taking dance lessons for three weeks now.
The pattern for forming present perfect progressive tense is as follows:
- Present tense form of have + been + present participle
To form the negative, place not between the have auxiliary and been. To form a question, move the have auxiliary to the beginning of the sentence, in front of the subject.
- She has been looking tired.
- Has she been looking tired?
- She has not been looking tired.