iBT新托福重点考察词汇：since

　　since　/ sɪns; sɪns/ prep
　　(used with the present or past perfect tense 与现在完成时态或过去完成时态连用) from (a specified time in the past) till a later past time, or till now 从（过去某时间）以来、 以后或到现在: I haven't eaten since breakfast. 我吃了早饭后到现在还什么都没吃呢. * She's been working in a bank since leaving school. 她中学毕业后就一直在一家银行工作. * He had spoken to her only once since the party. 自从那次聚会以来, 他只跟她说过一次话.
　　> since conj
　　(used with the present perfect, past perfect or simple present tense in the main clause 与主句中的现在完成时态、 过去完成时态或一般现在时态连用) from (a specified event in the past) till a later past event, or till now 从（过去某事）以来、 以后或到现在: Where have you been since I last saw you? 自从我上次见到你以后, 你到哪儿去了? * It was the first time I'd won since I'd learnt to play chess. 自从我学会下国际象棋以来, 这是我第一次赢. * How long is it since we visited your mother? 自从我们看望你母亲以来到现在有多长时间了?
　　because; as 因为; 既然; 由于: Since we've no money we can't buy a new car. 因为我们没钱, 没法买新汽车.
　　(idm 习语) ever since =>ever. since adv (used with the present or past perfect tense 与现在完成时态或过去完成时态连用) from a specified time in the past till a later past time, or till now 从过去某时间以来、 以后或到现在: He left home two weeks ago and we haven't heard from him since. 他两星期以前离开了家, 到现在我们一直没有他的消息. * She moved to London last May and has since got a job on a newspaper. 她去年五月到伦敦, 此后一直在报社工作.