‘Since’ used as a conjunction
When since is used as a conjunction, it joins a main clause and a subordinate clause. Since comes at the beginning of the subordinate clause.
- Mike has been promoted twice since he joined the company.
(main clause = ‘Mike has been promoted twice’; subordinate clause = ‘he joined the company’)
- I’ve been very busy since I started my new job.
Since can also mean because or as:
- I think I’ll stay home and watch a film, since it’s raining.
- Since the plane’s going to be an hour late, let’s go and get some coffee.
See examples of since used as a preposition or adverb.