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-ENCERRAR O SUBRAYAR LA EXPRESIÓN DE TIEMPO CORRECTA PARA CADA
ORACIÓN FOR / SINCE.

a) I've been here for / since 3 o'clock.

b) They've known each other for / since many years.

c) Nobody has heard from Carla for / since Saturday.
d) My mum has been in her new job for / since three weeks.

e) She hasn't called me for / since the party.

f) He has played for Arsenal for / since 2006.