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STRUCTURE

(=) Yes, (I/You/He/She/It/We/They) - have/has; No, (I/You/He/She/It/We/They) - haven't/hasn't.

(?) Have/Has - subject - been - verb (ing) - complement ?

(-) Subject - haven't/hasn't - been - verb (ing) - complement.

(+) Subject - have/has - been - verb (ing) - complement

SIGNAL WORDS

every night, every day

since, for

How long

EXAMPLES

(=) Yes, he has

(?) Has he been living on the next door since 1999?

(-) You haven't been studying for the final exams.

(+) I have been working here since 2011.

USES

Express an action that started in the past and is still going on in the present. Express an action that started in the past and has just finished.