- sinceW1S1 [sıns] prep, conj, adv[: Old English; Origin: siththan, from sith tham 'since that']1.) [generally used with a perfect tense in the main clause]from a particular time or event in the past until the present, or in that period of time▪ We've been waiting here since two o'clock.▪ I haven't played rugby since I left university.▪ She left London ten years ago, and I haven't seen her since.▪ The factory has been here since the 1970s.▪ It was exactly five years since her father had died.▪ Since the end of the war over five thousand prisoners have been released.▪ He lost his job five years ago, but has since found other work.▪ I left school in 1995, and since then I've lived in London.ever since(=all the time since)▪ We've been friends ever since we were at school together.▪ She's been terrified of the sound of aircraft ever since the crash.▪ We came to the UK in 1974 and have lived here ever since.2.) used to give the reason for something▪ Since you are unable to answer, perhaps we should ask someone else.3.) since when?spoken used in questions to show that you are very surprised or angry▪ Since when have you been interested in my feelings?4.) long sinceif something has long since happened, it happened a long time ago▪ I've long since forgiven her for what she did.▬▬▬▬▬▬▬WORD CHOICE: since, for, during, overUse since to say that something started at a point in time in the past, and is still continuing : He has been living in Leeds since 1998. | We've known about it since May.Since is usually followed by a time expression ('last year', 'this morning', '4 o'clock' etc) or by the simple past tense. Use the present perfect or the past perfect in the other clause : I have loved movies since I first went to the cinema. |He had been seriously ill since Christmas.!! Speakers of British English usually say it is a long time/two weeks etc since ..., and speakers of American English it has been a long time/two weeks etc since ..., but both uses are correct : It's weeks (BrE)/It's been weeks (AmE) since I saw Grandma.Use for when you state the length of time that something has been happening : We have known each other for ten years (NOT since ten years). | I had been waiting for hours (NOT since hours). |I haven't seen him for ages (NOT since ages).During and over are used when you state the period of time in which something happens or changes : During her first year at college, she had several boyfriends. | Over the last six months, crime has doubled.▬▬▬▬▬▬▬
Dictionary of contemporary English. 2013.