preposition
- from a particular time in the past until now
conjunction
- from the time when something happened until now
- because; for the reason that
adverb
- from a particular time in the past until now
Examples
- I haven’t seen him since Monday.
- She has been working here since 2015.
- Since you’re here, you might as well help us.
- He moved to California and has lived there ever since.
- Since it’s raining, we’ll stay inside.
- They’ve been friends since they were children.
- I lost my keys yesterday and haven’t found them since.