专四语法精讲概要.ppt

专四语法精讲 一、时态、语态 时态、语态需要掌握的要点： 1.表达将来时的形式? (1)在时间、条件、让步从句中，一般现在时代替将来时，但要注意区别从句的类型，如： I’ll tell him when you will ring again. 我告诉他你什么时候再来电话。(宾语从句) 比较：I’ll tell him when you ring again.你再打电话时我告诉他。(状语从句) (2)在make sure, make certain, see (to it) 后的that从句中，谓语动词用一般现在时代替将来时，如： See to it that you include in the paper whatever questions they didn’t know the answer to last time. (include 不能用will include或其他形式 过去完成时 一律用had + 过去分词构成。 用法： 1）表示发生在过去某一时间或动作之前的事情，即“过去的过去”。用过去完成时，必须有一个过去的时间或动作来作参照，说明在此之前某事已发生。如果两个动作都是在过去发生的，先发生的用过去完成时，后发生的用一般过去时。例如： She told me she had been there three times before. 她告诉我她以前到过那里三次。（“去过”发生在“告诉”之前） How long had he taught here by the end of last term? 到上学期末为止，他在这里教学多长时间啦？ （“教学”发生在上学期末结束之前） When we arrived, the football match had already begun. 我们到的时候，足球赛已经开始了。 She had visited China twice before she came this year. 她今年来中国之前已访问过中国两次了。 2.完成时是时态测试的重点，注意与完成时连用的句型和时间状语 ?(1)by/between/up to/till +过去时间、since、by the time/when +表示过去发生情况的从句，主句用过去完成时。 如：We had just had our breakfast when an old man came to the door. 2）过去完成时动词可以表示过去某一时刻之前发生的动作或呈现的状态，这一动作一直持续到过去这一时刻或将继续下去。例如： By the middle of last month, I had lived in Beijing for five years. 到上月中旬，我已在北京住了五年了。 By six o’clock they had worked for eight hours. 到六点为止，他们已工作八小时了。 When I came to Shanghai, he had been there for a long time. 我到上海时，他在那里很长时间了。 3）此外，过去完成时常用于 no sooner…than… 和 hardly(scarcely) …when… 这两个句型，前面部分用过去完成时，后面部分用一般过去时。例如： No sooner had he stolen the purse than he was caught red-handed. = He had no sooner stolen the purse than he was caught red-handed. 他刚偷到钱包就被当场抓获。 Saddam had hardly realized what was happening when he was captured. = Hardly had Saddam realized what was happening when he was captured. 萨达姆还没有意识到在发生什么事情就被抓获了。 将来完成时  shall/will + have + 过去分词 用法：将来完成时动词主要表示在将来的某一时刻或将来的某一时刻之前完成的动作，这一动作也可能继续进行。例如： By seven o’clock this afternoon we shall have got to Shanghai if the train keeps good line. 如果火车运行正常，我们今天下午七点就到上海了。 Before bedtime Xiao Ming will have completed his work. 到上床睡觉的时候