英语六级讲义―重点语法复习_大学英语单词

英语六级讲义―重点语法复习

　　(1)以when, whenever, as, since, till, until, before, after, as soon as, once, the moment, the instant, immediately, the day, no sooner...than, hardly/scarcely...when, instantly, every time, the minute, the second等引导的时间状语从句：

　　Susan worked in the library until she transferred(调转，调任)to the Advanced Training Center of State Power Corporation.

　　Ill ring you up as soon as I get an answer from Charlie.

　　Once she has made up her mind, Ross will never change.

　　Arthur and Molly were lovers when they were at college.

　　注意：when, while和as 引导时间状语从句时用法上的区别。

　　When既可表示一时性的动作又可表示持续的动作;while不能表示一时性或短暂的动作，只能表示持续性的动作或状态;as则表示两个动作同时进行或一个动作和一个状态同时进行。如：

　　As Professor Li entered, the hall burst into thunderous applause(雷鸣般的掌声) .

　　Till和until用法上的异同。

　　Till可用作及物动词，如：Farmers till the land.(农夫种田);until则不能用作动词;until 比till强调，故用于句首时通常用until而不用till，在口语中常用till而不用until; Not until的强倒装调句式不能用till替换，但注意not until开头的强调结构用于It is (was)that 这一强调句中时，从句和主句的主谓均不倒装。如：It was not until Grace fell asleep that I left the room.