内容正文:
专题三 动词
知识概要
动词在语言中是必不可少的一部分。它的语法现象也较多,但在初中范围主要有以下几方面问题。① 时态:初中范围主要有一般现在时,一般过去时,一般讲来时,现在进行时,现在完成时,过去完成时,过去进行时与过去将来时八种时态。② 语态:主动语态与被动语态。③ 助动词和情态动词。④ 非谓语动词,也就是不定式,动名词,现在分词及过去分词的用法。
1, 动词时态:每种时态主要掌握其用法、谓语动词的构成形式,常见的标志词以及疑问句、否定句等句式特点。
1,一般现在时:
主要有以下三方面的用法,① 用来表示现在的状态,特征。如:He works in a big company。The book is very interesting.② 表示习惯性和经常发生的动作,如:I often go to bed at 9∶30 ③ 表示普遍事实或客观真理,如,The earth moves around the sun
常与下列时间状语连用:1)Always, usually, often, sometimes, hardly, never等。 如,They usually go to school by bike.2)once a year, twice a week, every year/day/week等。如,He writes to his father twice a month.
谓语动词的构成形式:主语+动词原形/第三人称单数形式(三单)+----.是动词原形还是三单取决于主语,当主语是第三人称单数(he,she,it)时,谓语动词为三单,反之,则为动词原形。如,He plays basketball everyday. I have noodles for breakfast.
动词原形变单三记住六个字母:s,es, ies.具体说,1)一般情况直接在动词后加s,如,work- works, stay – stays 2)以s,x,ch,sh o,结尾的加es,如,watch- watches,finish- finishes 3)以辅音字母加y结尾加,如 study - studies
变疑问句,否定句时,当谓语是行为动词时,要用助动词do/does,可以总结为如下公式:一般疑问句:Do/Does + 主语+动词原形+---?如, Do they live in Beijing? Yes, they do. No, they don’t. Does he write to his father twice a week? Yes, he does. No, he doesn’t
否定句:主语+don’t/doesn’t+动词原形+---. They don’t usually go to school by bus.
2 一般过去时:
用法:主要用于表达过去时间内发生的动作或存在的状态,如:I was ill last week
过去时间状语有:yesterday,yesterday morning/afternoon/evening,the day before yesterday,last night/week/---,three days/years/--- ago, at that time/moment, just now等
谓语动词的构成形式:动词的过去式。过去式的构成分为规则变化和不规则变化(见不规则变化表)。规则变化主要是加ed,具体变化如下:1) 一般情况加ed, 如,stay - stayed 2)词尾有e的加d,如,like – liked 3)重度闭音节词,如末尾只有一个辅音字母,先双写该辅音字母,再加-ed.如, stop - stopped 4)以辅音字母加y结尾的,先改y为i,再加-ed. 如, study - studied
变疑问句,否定句时,当谓语是行为动词时,要用助动词did,可以总结为如下公式:一般疑问句:Did + 主语+动词原形+---?如, Did they live in Beijing last year? Yes, they did. No, they didn’t.否定句:主语+didn’t+动词原形+---. They didn’t go to bed until 10:00 yesterday night.
3,一般将来时:
用法:用于表示将要发生的动作或存在的状态,常与表示将来的时间状语连用:tomorrow,next week/spring/---, in+一段时间 (一段时间之后)。如, What will happen in 100 years?
其构成方式:① 用will (shall)+动词原形来表达将来在某一时间内要发