PRESENT PERFECT CONTINUOUS
(1) An action that started in the past and continues up to the present.
(2) An action that started in the past and suggests it is going to continue into the future.
(1) I am very tired now because I have been working all morning.
(2) I have been living at this address for six years now since 2007.
All the sentences are positive. In order to make them negative, we have to change them as:
(1) I am not / I have not (haven't) been working.
(2) I have not (haven't) been living.
All the sentences are statements. In order to make them interrogative, we have to change them as:
(1) Am I? / Have I been working?
(2) Have I been living?
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