Use of since and for in present perfect

1. Sintaxis:
For + Period
of time For a week
For a month
For 6 years
For two hours
Sintaxis:
Since + a
point in time Since 1980
Since March 2nd
Since 2:00p.m.
Since I was child.
Since last Monday.
Sintaxis:
How long...?
Used to explain
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Empleando el "present perfect" podemos definir
un periodo de tiempo anterior al momento
presente, considerando bien su duración, caso en
el que utilizamos "for" + periodo temporal, o bien
su inicio o punto de partida, caso en el que
utilizamos "since" + momento concreto. "for" y
"since" pueden asimismo emplearse con el "past
perfect". "Since" admite únicamente tiempos
verbales perfectos. "For" puede también
emplearse con el "simple past".
step01
step02
Identify what do you want
express:
-A period of time uses For
-A point in time uses
Since
step03
step04