Usage of « for » and « since » - Free english lesson
Chapter The Present Perfect Tense

« For » is used with cipher data indicating duration.
He has been playing tennis for two hours.

« Since » is used in order to indicate the moment of the action's debut.
He has been playing tennis since 4 o'clock p.m.

Progress in english with the story of the Lacoste family.
1 episode, 10 questions, 1 correction :