2011年工程硕士GCT英语辅导专栏（第十周）
文章作者 100test 发表时间 2011:07:06 04:44:33
来源 100Test.Com百考试题网
时态
１ 一般现在时
o 定义：通常表示习惯动作、一般状态、客观真理和永恒真理。
o 构成：动词原形，如果主语是第三人称单数，其动词后需加s或es
o He always gets up late on Sunday.
o The sun rises in the east and sets in the west.
一般现在时
o 使用场景
o 1 主要用来表示习惯性动作或自古已然的事态。
o Before I go to bed, I drink a glass of milk.
o He smokes heavily.
o Dogs bark.
o 2. 表示目前存在的状态(如能力、职业、特征等）
o He is a handsome young man.
o She speaks several languages fluently.
o Mary comes from New York.
o 3 当询问或引用书籍、通知或新近收到的信件的内容时
o What does the book say?
o 4. 表示计划中将来的行动或一系列行动，尤指旅途中的行动。
o We leave Beijing at 10:00 next Tuesday and arrive in Shanghai at 13:00. We spend three hours in Shanghai and leave for New York at 16:00.
o 5 表速度较快的球类比赛
o 常用的时间状语：always, often, every day, sometimes, usually, seldom, three times a day.
o 注意：在以as soon as, when, after等引导的时间状语从句中，或以if, unless等引导的条件状语从句中，通常使用一般现在时态。(主将从现）
o I ll ring you as soon as he comes back.
o You ll succeed if you try your best.
２ 现在进行时
o 定义：现在进行时表示说话时正在进行的动作，也表示目前一段时间内正在进行的活动。表示后一种情况时，动作也一定正在进行。
o She is playing the piano.
o I am thinking about a new plan these days.
o 常用时间状语：now, at present, always, for ever, all the time, these days, at this moment.
o 注意事项：
o 1 并非所有的动词都有进行时，有些表示状态和感觉的动词通常无进行时，除非这类动词的词义发生变化。如：be, love, like, hate, believe, think, feel, seem
o Do you see anyone over there?
o Are you seeing someone off?
o 2. 也可以表示将来的动作，它是按人们的计划，安排将要发生的动作或指即将开始的动作。
o I am leaving for Beijing tomorrow.
o Imagine I m seeing the Mona Lisa.
o 3. 与always, forever等表示频繁的副词连用，强调动作之经常，长带有赞赏或讨厌等感情色彩。
o She is always cooking some delicious food for her family.
o He is always going out on Sunday.
o They re forever complaining.
３ 一般过去时
o 定义：表示过去某个特定时间发生且一下子就完成的动作，也可以表示过去习惯性的动作。一般过去时不强调动作对现在的影响，只说明过去。
o I had a word with Mary this morning.
o He smoked forty cigarettes a day until he gave up.
o 常见时间状语：yesterday, last week, in 1993, at that time, once, once upon a time, the other day, just now, during the war, before, a few days ago, when 等。
o 注意事项：
o 1 used to do