Since (conjunction, preposition, adverb)
The word since can be a conjunction, a preposition, or an adverb.
Here are some examples:
‘Since’ as a preposition
- I haven’t seen him since this morning.
- Since joining the company, Mike has been promoted twice.
‘Since’ as a conjunction
Since is a conjunction when it joins two clauses:
- Mike has been promoted twice since he joined the company.
(clause 1 = ‘Mike has been promoted twice’; clause 2 = ‘he joined the company’)
- We’ve made a lot of new friends since we came to live in Yorkshire.
- Let’s discuss the problem now, since you’re here.
‘Since’ as an adverb
- He left this morning and we haven’t seen him since.
- He was sent to prison, but has since been released.