第二部分:语法知识 五、介词:常用介词:in, on, at, behind等 1.at表示时间概念的某一个点。(在某时刻、时间、阶段等)。 ?at 1:00(dawn,midnight,noon)在一点钟(黎明、午夜、中午) 2.on 1)表示具体日期。 注:(1)关于"在周末"的几种表示法: ??at(on)the weekend?在周末---特指 ??at(on)weekends?在周末---泛指 ??over the weekend?在整个周末 ??during the weekend?在周末期间 ? (2)在圣诞节,应说at Christmas?而不说on Christmas? 2)在(刚……)的时候。 On reaching the city he called up his parents. 一到城里他就给父母打了一个电话。 3.in 1)表示"时段"、"时期",在多数情况下可以和during互换,前者强调对比,后者强调持续。 in(during)1988(December,the 20th century)在一九八八年(十二月、二十世纪) 六、动词:动词的四种时态: (1)一般现在时: 一般现在时的构成 1. be动词:主语+be(am, is, are)+其它。如: I am a boy. 我是一个男孩。 2. 行为动词:主语+行为动词(+其它)。 如: We study English. 我们学习英语。 当主语为第三人称单数(he, she, it)时,要在动词后加"-s"或"-es"。如:Mary likes Chine.玛丽喜欢汉语。 动词+s的变化规则 1.一般情况下,直接加-s,如:cook-cooks, milk-milks 2.以s. x. sh. ch. o结尾,加-es,如:guess-guess, wash-washes, watch-watches, go-goes 3.以“辅音字母+y”结尾,变y为i, 再加-es,如:study-studies (2)一般过去时: 动词过去式详解 动词的过去式的构成规则有: A、规则动词 ① 一般直接在动词的后面加ed:如 worked , learned , cleaned , visited ② 以e结尾的动词直接加d:如 lived , danced , ud ③ 以辅音字母加y结尾的动词要改y为i再加ed(此类动词较少)如 study – studied carry – carried worry – worried (注意play、stay不是辅音字母加y,所以不属于此类) ④ 双写最后一个字母(此类动词较少)如 stopped B、不规则动词(此类词并无规则,须熟记)小学阶段要记住以下动词的原形和过去式:sing – sang , eat – ate , e – saw , have – had , do – did , go – went , take – took , buy – bought , get – got , read – read ,fly – flew , am/is – was , are – were , say – said , leave – left , swim – swam , tell – told , draw – drew , come – came , lo – lost , find – found , drink – drank , hurt – hurt , feel – felt (3)一般将来时: 基本结构: ①be going to + do; ②will+ do. be going to = will I am going to go swimming tomorrow(明天). = I will go swimming tomorrow. (4)现在进行时: am,is,are+动词现在分词 动词现在分词详解 动词的ing形式的构成规则: ① 一般的直接在后面加上ing , 如doing , going , working , singing , eating ② 以e 结尾的动词,要先去e再加ing ,如having , writing ③ 双写最后一个字母的(此类动词极少)有:running , swimming , sitting , getting
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