For/Since

Description

Using the " present perfect " we can define an earlier period of time to the present moment, considering either its duration case we use "for" + time period, or its beginning or starting point, in which case we use " Since "+ concrete moment . "For" and " since " can also be used with the "past perfect". " Since " only supports perfect tenses. "For" can also be used with the "simple past".
"FOR" + TIME PERIOD
For six years, for a week, for a month, for hours, for two hours 
I have worked here for five years.
" SINCE " + CONCRETE MOMENT
Since this morning, since last week, since yesterday since I was a child, since Wednesday, since 2 o'clock I have worked here since 1990.
" PRESENT PERFECT " WITH "FOR"
She has lived here for twenty years. 
We have taught at this school for a long time. 
Alice has been married for three months. 
They have been at the hotel for a week.
" PRESENT PERFECT " WITH " SINCE "
She has lived here since 1980. We have taught at this school since 1965. Alice has been married since March 2nd. They have been at the hotel since last Tuesday.
In the next picture there is a little explanation about the use of since/for, and some examples:

Following I leave you a video with more examples about since/for/ago:

Referencias Web:
  • http://www.curso-ingles.com/aprender/cursos/nivel-avanzado/verb-tenses-present-perfect/for-since-ago
  • http://www.ef.com.ec/recursos-aprender-ingles/gramatica-inglesa/present-perfect-con-for-since/
  • https://www.englishclub.com/grammar/verbs-m_for-since.htm


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