小学英语语法课件-常用连词 (共41张PPT) 全国通用

Presentation Sentences
before：在……以前，常与一般过去时、一般现在时连用。例： Try to finish your work before you leave. 离开前设法把工作做完。 I’ll stay here before my mother comes back. 在你妈妈回来前，我一直在这。
(对)There is no air and no water on the moon. (错)There is no air or no water on the moon.
解析：在否定中并列结构用or 连接，但含有两个否定词的句 子实际被看作是肯定结构，因此要用and。
Presentation Sentences
Unit 14
Conjunctions 常用连词
Warm up Presentation
Practice Production
Warm up
Tomorrow we will have a picnic in the park, but (表转 折)I can’t go, because (表原因) I am ill. I have to stay at home and (连接两个相同的句子) have a rest. When (表示 时间两个动作同时发生) I heard this news, I felt unhappy. While (然而) my teacher and my classmates help me a lot. I think if (引出条件) I was not ill, I would have a good time. Although (表让步) I don’t go, I am still happy.
“祈使句，+ or + 一般将来时的句子”是一个固定句型，表 示如果不做到祈使句表示的事情，就会有后面句子表示的结 果。
Presentation Sentences
and 和or 的区别：并列结构中，or通常用于否定句， and用于肯定句。
(对)There is no air or water in the moon. (错)There is no air and water in the moon.
Presentation Sentences
在although和though引导的让步状语从句中，是尽管或虽 然的意思。主句里不可用but,若要强调前后两部分的对比意 义，可在主句前加yet或still。例： Though/Although it was late, they went on working. 虽然很晚了，但是他们仍然在继续工作。 Although/Though he has a lot of money, yet / still he is unhappy. 他虽然有很多钱，但并不幸福。
Warm up
听了上面的故事，请你找出句与句，词与词之间的连接词， 并说一说它们在句中的作用。
连词——在词和词，短语和短语，句子和句子，从句和从 句之间起连接作用的词叫做连词。连词是虚词，在句子中 一般不重读，在句子中不能单独做句子成分。连词在句子 中所起作用的角度来看，连词分为两大类：并列连词和从 属连词。
but：我的功能是把两个意思相反或相对的句子连接起来。我 的同事还有：yet (可是)，while (而)等。 I heard a big noise and I looked out, but I didn't see anything. 我听到一声巨响，就往外看，但是我什么也没看见。 I'm poor, but I always enjoy myself. 我很穷，但是我总是过得很开心。 My elder brother likes playing basketball while I like playing football. 我哥哥喜欢打篮球，而我喜欢踢足球。
because表原因，用于解释某事的原因和动机，强调直接的原 因和因果关系。有because不能有so、相反有so不能有 because。 例：I do it because I like it. 因为我喜欢它所以我做它。 I can’t buy the book because I have run out of my money. 或I have run out of my money so I can’t buy the book. 我不能买这本书，因为我钱花光了。
When 和while When I left home, my mother was cooking. 我离开家的时候，我妈妈正在做饭。 I was reading a book, while my brother is watching TV. 我哥哥看电视时我正在读书。 We listened while the teacher read. 老师朗读时我们听着。 when和while：两者都表示“当……时候”。注意以下两句： I was doing homework when the phone rang. 当我做作业的时候，电话响了。 While I was doing homework, the phone rang. 当我做作业的时候，电话响了。
as soon as 引出的时间状语从句应用一般现在时表示将来 要发生的动作。例： I'll tell him as soon as I see him. 我一看见他我就告诉你。
Presentation Sentences
if连接条件状语从句，表”如果”。 例：Do you mind ifwenku.baidu.comI open the window? 开窗你不介意吧?
Presentation Sentences
after：在……以后，通常用于过去时、现在时或完成时 态的句子中。例： After we have finished tea, we will sit on the grass. 喝完茶之后我们将坐在草地上。 I went to bed after I finished my homework. 完成作业后我去睡觉。
either... or... 或者……或者……，谓语动词采用就近原则， 与or后的词保持一致。 Either he or I go to the meeting. 我和他都去参见会议。
Presentation Sentences
呈现从属连词：从属连词用来连接主句和从句。常用的从 属连词有：when, before, after, as soon as, because, if, though, although等。
Presentation Sentences
both …and：两者都…… She plays (both) the piano and the guitar. 她能演奏钢琴和吉他。
Presentation Sentences
not only…but (also), 不但……而且……，谓语动词采用就近 原则，与but (also)后的词保持一致。 as well as不但……而且…… She plays not only the piano, but (also) the guitar. 她不仅会演奏钢琴也会弹吉他。 注意：not only… but also 关联两个分句时，一个分句因有否 定词not 在句首时必须倒装。 Not only does he like reading stories, but also he can even write some. 他不但喜欢读故事，而且还能编写一些故事。 It is important for you as well as for me. 这对你和对我都很重要。
Presentation Sentences
or： 我是一位和蔼可亲的老师，一般情况下我不会强迫某人 去做某一件事情，我可以让他(她)自己做出选择。有时，我也 会比较严厉，这时候我会用命令的语气说“做好某事，否则 (要不然)就会……” You may do it yourself, or you can ask someone to help you. 你可以自己做，你也可以请人来帮你。 Work hard, or you can't pass the exam.= If you don't work hard, you can't pass the exam. 努力学习，否则你考试会不及格。
and是把两个或两个以上的有并列关系、动作先后关系或者 是有条件和结果关系的句子连接起来。 如： After lunch Aunt Huang came in and she looked worried. 午饭后黄阿姨进来了，她看起来很着急。(表示并列关系) Mary brushed her teeth and she went to bed. 玛丽刷完牙，然后上床睡觉。(表示动作先后关系)
Presentation Sentences
解析： 第一句： and 连接两个并列的谓语，所以 talk 应改为 talked。 第二句：and 连接两个并列的动词不定式，第二个不定 式往往省略to，因此sang 应改为 sing。 第三句：and 连接感观动词saw 后面的用作宾补的两个 并列分词结构，因此whisper应改为whispering。
Presentation
Look and Say
Presentation Sentences
并列连词用来连接具有平行关系的词、短语或句子。常用的 并列连词有：and, but, or, so, both…and, either…or, neither…nor, not only…but also等。
Presentation Sentences
Use your head, and you'll find a good way. 动动脑筋，你就会找到好的方法。(表示条件和结果) 该句相当于：If you use your head, you'll find a good way.
“祈使句，+and + 一般将来时的句子”这是一个固定句型， 表示如果做到了祈使句表示的事情，就会有后面句子表示的 结果。如： Work hard, and you will pass the exam. 努力学习，你就会通过考试。
Presentation Sentences
(错) They sat down and talk about something. (错) They started to dance and sang. (错) I saw two men sitting behind and whisper there. (对) They sat down and talked about something. (对) They started to dance and sing. (对) I saw two men sitting behind and whispering there.
Presentation Sentences
neither…nor 意思为既不……也不……，谓语动词采用就近 原则，与nor后的词保持一致。 Neither you nor he is to blame. 你和他都不用自责。 The weather is mild today, it is neither hot nor cold. 今天天气很温暖，不冷也不热。
Presentation Sentences
so： “因此、所以”。 我能迅速地把含有因果关系的两个简 单句连接起来。 This is our first lesson, so I don't know all your names. 这是我们的第一节课，因此并不是所有人的名字我都知道。 I am rich, so I can buy lots of nice things for myself. 我很富裕，所以我能给自己买很多好东西。