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1、单元语法归纳,1.过去进行时的概念:表示过去某个具体时刻正在进行的事情或动作。2.过去进行时的构成:主语+was/were+doing (现在分词)+其他 肯定句式为:主语+was/were+动词的现在分词+其他。如: They were playing basketball at that time. 那时他们正在打篮球。 否定句式为:主语+was/were+not+动词的现在分词+其他。如: They were not playing basketball at that time. 那时他们不在打篮球。,(一) 过去进行时,一般疑问句式为:Was/Were+主语+动词的现在分词+其他?如
2、:Were they playing basketball at that time?那时他们正在打篮球吗?特殊疑问句式为:特殊疑问词+was/were+主语+动词的现在分词+其他?如:What were they doing at that time?他们那时正在干什么?3.与过去进行时连用的时间状语:this morning,at that time, at this time yesterday,the whole morning, all day yesterday, from nine to ten last evening, when, while等。,(二)情态动词must1.表
3、示“必须”,此时可用于肯定句或疑问句,用于否定句时,mustnt的意 思是“一定不要”“不能”,而不表示“不必”。如: Must we finish the work tonight? 我们必须今晚完成这项工作吗? must主要表示现在或将来,但在间接引语中也可表过去(=had to)。如: She asked her boss if she must (had to) work overtime. 她请示老板她是否要加班。 对于must开头的一般疑问句,若作否定回答,可以用neednt,不用 mustnt。如: “Must I clean all the rooms?” “No, you n
4、eednt.” “这些房 间我都得清扫吗?”“不必。”,2.表示推测意为“准是”“一定是”,通常只用于肯定句。若用于否定句或 疑问句,则用can 代之。如: The ground is wet.It must have rained last night. 地面湿了。昨晚一定下雨了。 That cant be Mr. Li. He has gone to Shanghai. 那一定不是李先生。他去了上海。3.must与have to的区别 两者都表示“必须”,但must侧重于说话者的主观看法,认为有必要或有 义务去做某事;have to 则侧重于客观需要,含有“不得不”“被迫”之 意。如:Ev
5、eryone must keep the law.人人都要守法。 The last bus has gone.Well have to walk home. 最后一班车已经开走了。我们不得不走着回家了。,一、单项选择( )1.Susan and Lily tomatoes and other vegetables on the farm this time yesterday. (2014上海) A.pickB.are picking C.will pickD.were picking( )2.I saw him in the library yesterday. He a book at t
6、hat moment.(2013天津) A.readsB.is reading C.was readingD.will read( )3.When I got home, my son the music. A.am listening toB.listened to C.was listening toD.was listening( )4.We heard a cry when we TV last night. A.were watchingB.would watch C.watchD.watched( )5.The traffic light is red. You cross the
7、 street until it turns green. A.cantB.neednt C.mustntD.may not,D,C,C,A,C,二、句型转换6.Grandpa was mending his clock when I reached home.(改为一般疑问句) grandpa his clock when you reached home?7.We were singing and dancing from 3 to 5 yesterday afternoon. (对画线部 分提问) you singing and dancing?8.Must I finish my wo
8、rk by tomorrow? (作否定回答) , .9.The students were talking about the news when the teacher came in.(改 为否定句) The students about the news when the teacher came in.10.The woman must be Mrs. Brown, ?(完成反意疑问句),Was,mending,When,were,No,you neednt,were,not,talking,isnt,she,句型转换1.The old man is so old that he c
9、ant look after himself.(改为同 义句) The old man is old look after himself.2.My father lay in the bed just now.(用at this time yesterday改写 句子) My father in the bed at this time yesterday.3.I like going shopping better than staying at home.(改为同义句) I shopping at home.,【教师备用】,too,to,was,lying,prefer,going,to,staying,易错提醒: 1.so.that.意为“如此以至于”,当that后从句是否定句时,可以与too.to互换。 2.at this time yesterday 与过去进行时态连用。过去进行时态的结构为:主语+was/were+v.-ing+其他。 3.prefer doing to doing 意为“比起更喜欢”,可以和like.better进行互换。,