FOR and SINCE

FOR and SINCE

1. FOR

   • USE
     • when we measure a period of time up to the present
     • present perfect tense
     • Simple past tense
   • EXAMPLES
     • I have known her for a long time.
   • The present tense with For
     • Refers to a period of time that extends into the future.
       • How long are you here for? (Until when)
       • How long have you been here for? (Since when)
   • specific period (or duration) of time
     • Period of time

2. SINCE

   • Since + a point in time (in the past), until now.
     • I've been waiting since 7 o'clock.
     • I have known him since January.
   • Refers when things began
     • Gives the starting point of an action
   • USE
     • WITH
       • PERFECT TENSES
         • Present perfect
         • Past perfect
     • structure It has been + period of time + since.
       • It has been two months since I last saw her.
   • the starting point of a period of time (continues to now).
     • Point in the past
   • Can't use in simple past tense