FOR OR SINCE?
Do we have to use for or since while we are talking about present perfect? The diference between for and since is easy: FOR is used when we are talking about a period of time: four days, two weeks, one hour, ... SINCE is used when the are describing a centain point in time: since I was five years old, since last week, since 2007... KAHOOT FOR OR SINCE KAHOOT FOR OR SINCE II