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The Word 'Since'
The English word 'since' is very versatile. 'Since' can be a:
Many English-learners have been introduced to 'since' in its prepositional form. In this case, the word links conditions (nouns), actions (verbs), and specific points in time.
The United States of America has been a republic since 1776.
They've been living here since the summer.
As a conjunction, 'since' links two clauses together.
I have known her since she moved here last summer.
'Since', in its conjuntion form, can also act as a synonym to the word 'because' or 'as'.
We didn't make it to the store this weekend since it closes early on Saturdays.
As an adverb, 'since' indicates when the conditon and/or action (verb) began and how it continues.
I got hired right after university and have been working here since.
We got here at five and have been waiting since.
'Since' can also indicate a particular point in time between the start of a condition and/or action and now.
At first, they decided not to go, but they have since changed their mind.
She used to teach at that university but has now since retired.
Adding 'ever' to form 'ever since' increases emphasis and emotion:
They have not spoken to each other ever since the last party.
They moved here forty years ago and have lived in that house ever since.
Sometimes 'long' is used:
We've been living here long since (then).
'Since when?'' is a phrase used to question at what point in time a condition started. It is often used in a perturbed and/or sarcastic manner.
Since when have you been living here?
You smoke? Since when?