1、Unit4 Global warmingGrammar 教案Knowledge and skills:1. Revise the usages of the emphatic sentences.2. Get the students to know how to use the emphatic sentences.3. Teach the students how to the emphatic sentences in their composition and daily communication.Process and methods: Explanation; exerciseE
2、motion, attitude and values: Build up the students confidence in grammar learningTeaching important points and difficult points:1.How to contrast the emphatic sentences and the attributive clause.2.How to use the emphatic sentences in different situation.Teaching methods and means:1. The English Fou
3、r-in-one Teaching Method.2. Question-and-answer activity.Teaching procedures强调是一种修辞效果，为了对一定语境中的部分信息内容进行突出强调而采用的一种手段。强调的方式有很多种，但英语中强调句的基本结构是: “It is / was + 被强调部分 + that (who) + 其余部分”。一、It is(was)+被强调部分+that(who)+其余部分。1.此强调句可以强调主语，宾语，表语，同位语，状语等。It ,that本身没有词义，只起引导作用。 典例：I saw Kate in the park last we
4、ek. (原句)It was _I_ that/who saw Kate in the park last week （强调主语）It was _ that/who/whom I saw in the park last week. （强调宾语）It was _ that I saw Kate last week. （强调地点状语）It was _ that I saw Kate in the park. （强调时间状语）2. 在强调句中，如果叙述的是现在和将来的事情，be动词用is; 如果叙述的是过去的事情be动词用was练习：(填空)It _ he that will go to the
5、cinema. It _ from the sun that we get light and heat. It _in Shanghai that I was born.3. 当被强调部分指人时，可以用that连接，也可用who / whom连接；指物时，只用that 连接。练习：It was Tom _ I met last week. It is a new book _ his brother wants to buy. 4. 强调时间、地点状语时 , 只用that ,不用when , where . 练习：It is at 5 oclock _ the train will arri
6、ve. It was in the park _I saw Kate last week.5.若被强调的部分是句子的主语时，那么that/who之后的谓语动词和被强调的主语保持一致。填空练习： It was he who _ late. It is I who_ late. It is they that _ late. 6. 强调句的一般疑问句为“Is (was) it +强调部分+ that? 强调句的特殊疑问句为：“特殊疑问词+ is (was) it +that+陈述句语序?”结构。典例： He will leave for Hong Kong at 7:00 . It is at 7
7、:00 that he will leave for Hong Kong.Is it at 7:00 that he will leave for Hong Kong?When is it that he will leave for Hong Kong?（强调陈述语序）7.与否定词not连用的 until短语或从句在被强调时应注意否定转移。其结构为“It is/was not untilthat” 典例：1）I didnt finish my homework until 5:00.It was not until 5:00 that I finished my homework.2） He
8、 didnt realize his mistakes until he graduated from high school. It was not until he graduated from high school that he realized his mistakes.8. 定语从句和强调句型容易混淆，如果去掉it is / was , that 句子仍然通顺成立，则为强调句型，不成立不通顺，则为从句。比较训练： It was at six oclock that he got home. It was six oclock when he got home.二、其他强调形式1.
9、 It be that.句型不能强调谓语部分，若要强调谓语，则须在谓语动词原形前面加上助动词do, did, does.I really like you ,and I do hope everyone has a promising future.2. 用副词 really, still, even强调。It was hot yesterday, but it is even hotter today.3. 用重复一个词来达到强调效果。He told us an old story over and over again.4. 用倒装表示强调。Only in this way can he
10、solve the problem.5. 一些短语 on earth, at all, in the world等含有强调意味的。What on earth do you want to do?He didnt care about it at all.三、 强调句注意事项1. 强调句型的特点去掉It is(was)及that(who)后，在不添词、不减词的前提下能重新构成一个意义完整的句子。这也是判断一个句子是否是强调句型的依据。2. 强调句型的时态如果原句中谓语动词使用的是现在或将来时间范畴的时态（一般现在时、现在进行时、现在完成/现在完成进行时、一般将来时、将来进行时、将来完成时等），用
11、It isthat。如果原句中谓语动词为过去时间范畴的时态（一般过去时、过去进行时、过去完成时、过去将来时等），则用It wasthat。HomeworkRewrite each sentence with “It is that”to give more emphasis to the underlined part.1. Greenhouse gases have warmed the earth by trapping heat energy in the atmosphere. 2. The greenhouse effect gives the earths surface the
12、average temperature of 15. 3. Much of the energy used to light and heat our homes comes from fossil fuels. 4. The biggest producer of greenhouse gases is the United States of America. 5. Carbon dioxide stays in the atmosphere for centuries while other greenhouse gases stay in the atmosphere only for a day or less. 6. Low-lying countries feel their very existence is in danger from rising sea levels.