| 单词 | since |
| 释义 | conjunction | preposition | adverb sincesince1 /sɪns/ ●●● S1 W1 conjunction 1at or from a time after a particular time or event in the past: A lot has happened since we graduated from college. I haven’t seen Michelle since I moved away from Los Angeles.2continuously during the period of time after a particular time or event in the past: Darla’s been really happy since she started work. We’ve been friends ever since we met in first grade.3used to give the reason for something: I’ll be 40 next month, since you ask. Since nobody’s replied yet, I guess they’re not interested.► see thesaurus at because [Origin: Old English siththan, from sith tham since that] conjunction | preposition | adverb sincesince2 ●●● S2 W1 preposition 1at or from a time after a particular time or event in the past: Unemployment is now at its lowest point since World War II. Sarah’s been sick since Friday. Ever since the accident, I haven’t been able to use my right hand. → see Word Choice at from2since when? spoken used in questions to show surprise, anger, etc.: Oh, yeah? Since when are you in charge around here?GRAMMAR: since, for, ago• Use since to say that something started at a point in time in the past, and is or was still continuing. Since is used with verbs in the present perfect or past perfect tense: We’ve been here since Tuesday morning. Doug hadn’t been the same since his father died six months earlier. Don’t say: He hadn’t been the same since six months.• Use for for saying how long something continues, without necessarily saying when it starts or finishes. It is used with all verb tenses: We lived there for a long time. Tony will be staying with us for three days.• When you use for with the present perfect tense, it gives a period of time that ends at the time of speaking: I’ve been waiting for two hours. Don’t say: since two hours.• Use ago mainly with the simple past tense for saying how long before now something happened: Marlene called ten minutes ago. Don’t say: since ten minutes. conjunction | preposition | adverb sincesince3 ●●● S2 W2 adverb [used with the present perfect and the past perfect tenses] 1at a time in the past after a particular time or event: Her husband died over ten years ago, but she has since remarried. Many of our friends have since moved away. Greg left work Tuesday afternoon and hasn’t been seen since.2for the whole of a long period of time after a particular time or event in the past: We bought this house in 1986 and have lived here ever since. → see also long since at long2 (9) |
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