内容正文:
授课主题
第7讲--否定句&一般疑问句
教学目标
1. 复习掌握陈述句改为否定句;
2. 复习掌握陈述句改为一般疑问句;
教学重难点
重点:掌握句型转换的做题技巧
难点: 遇到三单时助动词的选择
教学内容
★必备知识点:
1. be动词:am、is、 are、 was、 were;be动词后接名词,形容词或动词的ing形式。
2. 助动词:do、does、did、 have、 had;助动词后的动词用原形。
3. 情态动词can、must、will、may、need等;情态动词+动词原形
★★动词的分类:
Be动词:is, am, are, was, were
助动词:do, does, did, has, have, had动词
情态动词:can, must, may, should, 等
实义动词:run, eat, play, like, 等等。
【知识梳理1】 陈述句变为否定句
一、含义:句子当中有not或者有表示否定含义的词,就叫做否定句。
二、方法:就是在句子当中加上not就变成了否定句。
三、 步骤如下:
1. 看肯定句中有没有be动词(am、is、 are、 was、 were)或情态动词(can),如果有,直接在其后加not,其余照抄就可以。
1) 在be动词后加not。如:is not , are not , am not, was not, were not;
2) 在can,等后加not。如:can not(缩写 can’t)
例: I am a student. → I am not a boy.
Miss Li can dance. → Miss Li can’t dance.
2. 如果句中没有be动词或情态动词,变否定要找助动词do的相应形式(do、does、did)帮忙,且原句的谓语动词要变回原形。
例: Jenny has some Chinese friends. → Jenny doesn’t have any Chinese friends.
They go to school by bike. → They don’t go to school by bike.
Peter did his homework yesterday. → Peter didn’t do his homework yesterday.
【注】①借哪一个助动词由原来的谓语动词决定.
②句中出现的do, does, did一般都不是助动词,需要去借助动词,并把上面三个单词变为原形do.
③句中如果有some,把some改为any; 句末如果有too,把too改为either.
3. ★特殊情况:祈使句(以动词原形开头的句子)的否定:在句子开头Don’t即可。
例:Look at the window, please! → Don’t look at the window, please!
【巩固练习1】
1. His father goes to work by bus.. __________________________________________
2. These cats are crying. __________________________________________
3. They can swim. __________________________________________
4. His father was an English teacher. __________________________________________
5. He does well in Maths. __________________________________________
【知识梳理2】