until和since引导的时间状语从句 until/till 二者意义相同，until 比till正式，句首只能用until. I will stay her until/till he comes back.   我会一直陪着她直到他回来。 肯定句且谓语动词为延续性动词时表示“直到...为止”；否定句且谓语动词为终止性动词时表示 “直到...才...”，常构成“not...until...=before... He won’t go to bed until her father returns. 直到她父亲回来他才睡觉。 但not until放在句首时，主句应该半倒装（倒主不倒从）。 我不会离开直到他回来。 单词不用记下载 英语词汇立体记忆 新概念英语青少版 since prep “自从...以来” 主句（一般/现在完成时）+since+时间点 He has been here since 2000.     他从2000年起就在这里了。 adv “从那以后” since then/ever since 强调某一动作或状态的一直，它所修辞的主句谓语动词须为延续性动词。 John caught cold last night and he has been in bed ever since. 约翰昨晚感冒了，从那以后他就一直躺在床上。 conj  主句（一般/现在完成时）+since从句（vt-ed） （1）主句谓语动词为非延续性动词时，必须强调动作的多次。 Great changes have taken place since I left this city.（take place 为终止性动词，故译为“自从我离开这城市，发生了很多变化”） （2）从句谓语动词为非延续性动词时，则从句的动作表示延续多长时间了，按正常语序翻译。 I have known you for a long time since he joined the Chinese society.    自从他加入中国社会以来，我认识你很久了。 （3）若从句谓语动词为延续性动词时，则从句的动作表示已结束多长时间了。 He has written to me frequently since he was ill. 自从病好以后，他经常给我写信。 （4）it is /was/has been+一段时间+since（vted）... “自从...有多长时间了” It is/has been a few years since we met last time. 我们上次见面已经有几年了。 1. He is better than _______ I last visited him. A. when B. that C. how D. Which 2. _______ the punishment was unjust, he accepted it without complaint. A. So long as B. Even though C. Since D. While 3. ________ the grandparents love the children, they are strict with them. A. While B. As C. Since D. Because 4. _______ I can see, there is only one possible way to keep away from the danger. A. As long as B. As far as C. Just as D. Even if 5. _______ rich one may be there is always something one wants. A. Whatever B. Whenever C. However D. Wherever 6. John shut everybody out of the kitchen _______ he could prepare his grand surprise for the party. A. which B. when    C. so that D. as if 1. A 【解析】than 后省略了 he was，假若补充完整，全句即为 He is better than he was when I last visited him。 2. B 【解析】比较四个选项：so long as(只要)，even though(即使)，since(自从，既然)，while(当……时候)，其中只有B的意思最合适，全句意为“即使处罚不公平，他毫无怨言地接受”。 3. A 【解析】while 在此不表示“当……的时候”，而表示“尽管”。 4. B 【解析】as far as 意为“尽，就，至于”，常用于 as far as I know(据我所知)，as far as one can see(在某人看来)，as far as one can(某人尽力)，as far as sth / sb is concerned(就某事 / 某人来说)等结构。 5. C 【解析】however 在此引导让步状语从句，意义上相当于 now matter how。 6. C 【解析】so that 引导目的状语从句，其意为“为了”。