For / since

For and Since – both, are prepositions.

For – is used when mentioning a ‘duration of time’.

Since – is used when mentioning ‘a particular time’.


For . 

  • I waited  for 2 hours.
  • I have been living here  for 20 years.
  • He has been on a leave  for almost a week now.
  • She has been studying non stop  for three days.
  • They have taught in this school  for more than a decade.

Since .

  • He was waiting  since 10 AM.
  • I have been living here  since 1995.
  • I haven’t seen them  since Vicky’s wedding.
  • They have been in the meeting  since 9 in the morning.
  • She hasn’t kept in touch  since college ended.