jueves, 17 de octubre de 2013

PRESENT PERFECT CONTINUOUS


PRESENT PERFECT CONTINUOUS


SUBJECT + HAVE / HAS + BEEN + VERB-ing + (Complements)
 
STATEMENT        I have been studying for ten hours
                          She has been writing a composition since Sunday
                          They have been walking home every day

NEGATION            I have not been studying for ten hours
                She has not been writing a composition since Sunday
                            They have not been walking home every day

INTERROGATION   Have I been studying for ten hours?
                  Has she been writing a composition since Sunday?
                             Have they been walking home every day?

TIME EXPRESSIONS:
 
Those related to perfect tenses.

USES:

·                   To emphasize the duration of the action: He has been training for the marathon for months
·                   Actions recently finished with a visible effect in the present: I'm tired because I have been studying all day
·                   Actions that began in the past and are not yet finished: I have been living in this house all my life