(
课件网) 时态 一般现在时 There are many variations of passages of Lorem 1.结构 肯定句式：主语+动词原形/动词的第三人称单数+其他 否定句式：主语+(助动词)don't/doesn't+动词原形+其他 一般疑问句式：Do/Does+主语+动词原形+其他 特殊疑问句：特殊疑问词+do/does+主语+动词原形+其他 What do you do on weekends 简略回答：(肯)Yes,主语+do/does (否)No,主语+do/does not 缩写形式： don't = do not doesn't = does not 例句：He often goes swimming in summer. I usually leave home for school at 7 every morning. 2.用法 （1)表示经常的、习惯性的动作或存在的状态，常与表示频度的副词连用。 常用的频度副词有：always、often、usually、seldom、never、sometimes, every week (day, year, month…), once a week, on Sundays.频度副词在句中通常放在行为动词之前，系动词、助动词之后。 例如：He usually walks to school. I usually leave home for school at 7 every morning. （2)表示主语具备的性格、特征和能力等。 例如：All my family love football. My sister is always ready to help others. Ann writes good English but does not speak well. （3)表示客观真理、客观存在、自然现象。 例如：The earth moves around the sun. Shanghai lies in the east of China. 4)表示按计划或安排好的，或将要发生的动作，可用一般现在时表将来。 但只限于start,begin,leave,go,come,arrive,return,take place等。 例如：The train leaves at six tomorrow morning. He comes back tonight. （5)在复合句中，当主句是一般将来时，时间或条件状语从句的谓语动词只能用一般现在时来表示将来要发生的动作。 例如： I'll tell him the news when he comes back. 一般现在时的时间标志词 every系列： every morning, every afternoon, every evening,every day, every week, every month, every year 频度副词系列： always,usually,often, sometimes, seldom,never 频度词组系列： once a week,.twice a week,three times a week, four times a week 一般过去时 一、概念 表示在的过去某个时间里所发生的动作或存在的状态。通常在句子里找到表示过去时间的词或词组。如：yesterday ,yesterday morning,yesterday afternoon,yesterday evening,the day before yesterday(前天), last night, last week, last month, last year, a momentago(刚才),just now(刚才), two days ago,a week ago ,in 1990等。 二、动词过去式的构成规律 (一)规则动词的过去式 1、一般情况下，在动词原形后面加-ed;如：look→looked play→played; 2、以不发音e结尾的动词，在词尾直接加-d;如：live→lived use→used; 3、以“辅音字母+y”结尾的动词，先将y改为i,再加-ed;如：study→studied, try→tried fly→flied 4、以重读闭音节(即辅音+元音+辅音)或r音节结尾，末尾只有一个辅音字母的动词，要先双写这个辅音字母后，再加-ed。如：stop→ stopped plan→planned; 二、动词过去式的构成规律 (二)不规则动词的过去式 1、改变动词中的元音； begin→began drink→drank come→came eat→ate grow→grew run→ran know→knew win→won speak→spoke take→took write→wrote get→got 2、变词尾的-d为-t ; build→built lend→lent send→ sent spend→ spent bend→bent 3 、与动词原形一样； cut→cut put→put cost→cost hurt→hurt shut→shut 4 、变-ay为-aid(少数动词); say→ said pay→paid lay→laid 5、采用不同词根； sell→ sold teach→taught buy→bought 6 、其 ... ...
