Connection with past: the situation started in the past. Connection with present: the situation continues in the present. For and Since with Present Perfect tense We often use for and since with perfect tenses: • We use for to talk about a period of time: five minutes, two weeks, six years • We use since to talk about a point in past time: 9 o'clock, 1st January, Monday for since a period of time a point in past time - - - - - - - - - - - - - • - - - - - - - - - - 20 minutes 6.15pm three days Monday 6 months January 4 years 1994 2 centuries 1800 a long time I left school ever the beginning of time etc e