Since expresses duration up to the present.
When we use since, we are saying that something began in the past and is unfinished:
Ann:How long have you lived in your current apartment?
Bob: I have lived here since 2017.
Ann: Have you seen her since summer?
Bob: No, I haven't seen her since summer because she moved away.
I have lived in this house since 2007.
(= 'I moved here in 2007 and I still live here.')
Ann: How long have you been married?
Bob: We’ve been married since last July.
(= 'We got married last July and we’re still married.')
Ann: How long have you known him?
Bob:I've known him since we were at school.
(= 'I knew him at school and I still know him.')
Ann: Have you seen your friends since the lock down started?
Bob: I have not seen my friends since the lock down started.
I've known my neighbor since the day we moved in.
"I have lived here since 2009." - 2009 is the starting point.
"They've all been in a meeting since 11am." - 11am is the starting point.
"She's been sleeping since last night." - Last night is the starting point.
We use the present perfect simple or present perfect continuous with since:
I have had this car since last April. (present perfect simple)
I have had this laptop since last January. (present perfect simple)
Mary has been working here since 2013. (present perfect continuous)
I have been working here since the start of the year. (present perfect continuous)
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.
It was 2019, and I had been studying in Lviv since 2018.
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 have completed one task since this morning.
I have learned something new nearly everyday since I started working with my new team.
I've been waiting here since 9 o'clock.
I haven't washed my car since last Friday.
I've had a headache since last night.
We have been here since six o'clock.
It has been raining since Monday.
I haven't eaten since yesterday.
I've loved you ever since I met you.
We use for + a time period:
Ann:How long have you been living here?
Bob:"We've been living here for a long time." - A long time is the duration/length of time.
We have lived in this house for thirty years.
I've been waiting here for three hours.
I haven't spoken with her for five years.
I have lived in New York for all of my life!
I have lived here for eight years.
The phone rang for a few minutes.
I have been working for ten hours.
The cat has slept for ten hours.
I will be in Paris for two weeks.
I study English for an hour a day.
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 o'clock.
It will cost from 100euro to 200euro depending on which options you want.
This tour will cost from X to Y, depending on the number of places you want to visit.
From the 1920s until his death, Picasso lived in France.