For or Since?

For /fɔːʳ/  and Since /sɪns/  for Time

We often use for and since when talking about time.

for + period 
A period is a duration of time, for example: 5 minutes, 2 weeks, 6 years. 
For means "from the beginning of the period until the end of the period." 
   for three days, for 5 months, for 7 years, for 3 centuries, 
   for a long time, for ever
since + point 
A point is a precise moment in time, for example: 9 o'clock, 1st January, Monday. 
Since means "from a point in the past until now." 
   since 9 am, since Monday, since January, since 1999, since 1600, 
   since I left school, since the beginning of time

Exercises:  Click here to practise the use of FOR and SINCE.