Since, for, from
|Since expresses duration up to the present.
When we use since, we are saying that something began in the past, but is unfinished.
I have lived in this house since 1997.
(= 'I moved here in 1997 and I still live here.')
We’ve been married since last June.
(= 'We got married last June and we’re still married.')
I've known him since we were at school.
(= 'I knew him at school and I still know him.')
|We use the present perfect simple or present perfect continuous with since.
I have had this car since last April.
Mary has been working here since 2003.
|We can use the past perfect tense with since to express duration from a point in the past.
It was 1974 and he had been living in London since 1964.
|Since vs. for|
|Since and for both express duration up to a point in the present, but we use them differently.|
|We use since + the starting point of the activity.
We have lived in this house since we got married.
I've been waiting here since 9 o'clock.
|We use for + a time period:
We have lived in this house for thirty years.
I've been waiting here for three hours.
|Since vs. from|
|We use since and from to express duration. Both tell us the starting point of an activity.|
|Since expresses duration of an unfinished action, up to a point in the present.
I've been here since 8 o'clock this morning so I'm going home now.
I've been here from 8 o'clock this morning.
|We use from in other cases:
I will be here from 8 o'clock tomorrow.
I will be here since 8 o'clock tomorrow.
The shop is open from 9 a.m on Saturdays.
The shop is open since 9 a.m on Saturdays.
|We say from . . . to or from . . . till / until.
He works from 8 to 5.
From the 1920s until his death, Picasso lived in France.