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1、Grammar,Unit 4 Natural disasters,1. To learn to use it as the empty subject,Objectives,Using it as the empty subject (I),Have A L k,Its nine oclock in the morning. My bedroom floor is a pool of water. It is one oclock. It is summer now. It rained all day. It is only a five-minute walk from my home t
2、o the school. It is hot in this room.,Its _ in the morning. My bedroom floor is a pool of water. _ is one oclock. It is _now. It _ all day. _ is only _ from my home to the school. _ is _ in this room.,nine oclock,It,summer,rained,a five-minute walk,It hot,It,go,Ready?,翻译下列句子。,现在十二点十分。 距离海滩两英里远。 今天早晨
3、下雨了。 现在天气相当暖和。,Its ten past twelve.,Its two miles to the beach.,It was raining this morning.,Its quite warm at the moment.,以上我们已经通过归纳总结和练习对本课的语法内容有了一定的了解，下面就让我们根据之前练习的考察情况进一步选择讲解 该语法项的重难点。,在表示时间、季节、天气、温度或距离的表达方式里，我们用 it 作形式主语。此时，it无实际意义但不可以省略。如： It is half past twelve. It is spring. It is fine today
4、. It is twenty-five degrees centigrade. It is two kilometres to the post office.,it 的用法 I,Answer the questions using it as the subject. (P 55),A,It is sunny.,It is five oclock.,It is 27 June.,It is summer.,It is three kilometres.,Put the words in the correct order to make meaningful sentences. (P 56
5、),B,It is time for supper now.,It is autumn in Australia now.,It is about five kilometres to the park.,It was windy yesterday.,Using it as the empty subject (II),Have A L k,My boss has given me some work. Its important to stick with it. 2. It took a long time to build the house. 3. It is wrong to pa
6、y no attention to Kevin. 4. It is not a good idea to sit around and worry about the flood. 5. It seemed that nowhere was too far for Zheng He to visit. 6. It seems/appears that nobody is paying any attention to the flood.,My boss has given me some work. _ important _ it. _ took a long time _ the hou
7、se. 3. _ is wrong _ no attention to Kevin. 4. _ is not a good idea _ and _ the flood. 5. It _ that nowhere was too far for Zheng He to visit. 6. _ nobody is paying any attention to the flood.,Its,to stick with,It,to build,It,to pay,It,to sit around,worry about,seemed,It seems/appears that,go,Ready?,
8、Everyone knows that _ is dangerous to play with fire, but _ is difficult is to prevent children from playing with fire. A. it, it B. what, what C. it, what D. what, it,以上我们已经通过归纳总结和练习对本课的语法内容有了一定的了解，下面就让我们根据之前练习的考察情况进一步选择讲解 该语法项的重难点。,当句子的主语是动词不定式短语时，动词不定式短语一般不放在句首，而通常用it来作为句子的开头，动词不定式短语则放在句末。如： It i
9、s pleasant to sit in the Sun. It was a pleasure to sit in the Sun.,it 的用法 II,注意： “It + is + 形容词 + for + 宾语 + to do sth.” 句型通常与表示可能性、必要性、重要性、紧迫性、频繁程度以及价值判断等的形容词连用。如：,It is impossible for me to finish the writing in half an hour. It is strange for her to be late for school.,It 作为形式主语还常见于It seems / app
10、ears that 的句型中。如： It seems/appears that his mother knows the truth.,具有最高“信息价值”的较长、较复杂的结构通常位于句末，因此，我们常使用带 “形式主语it”的结构，而将充当主语的从句或动词不定式移到句末。,Write a sentence using it and a to-infinitive under each picture below. (P 57),C,It is important to stay calm when there is a fire.,It is dangerous to start a fir
11、e in the forest.,It is a good idea to take an umbrella.,It is nice to have a picnic in the park.,Put the words in brackets in the correct order to complete the conversations. (P 57),D,It seems that a typhoon is coming.,It appears that the flight has been cancelled.,It seems that something bad has ha
12、ppened to her.,To have a good knowledge of history is very helpful for all of us. To learn a foreign language is very useful for a scientist. To finish this work in three hours is necessary.,It is very helpful for all of us to have a good knowledge.,It is necessary to finish this work in three hours
13、.,It is very useful for a scientist to learn a foreign language.,I. 用it作形式主语改写句子。,现在十点半了。 好像他又犯了同样的错误。 在那个城市夏天炎热冬天寒冷。 很容易理解他为什么没回来。,It is ten thirty now.,II. 翻译下列句子。,It appears that he has made the same mistake again.,It is hot in summer and cold in winter in that city.,It is easy to understand why he has not come back.,Homework,1. Review the grammar weve learned today. 2. Finish the exercises in Learning English. 3. Preview Speaking on page 58.,
