(课件网) Unit 4 Natural disasters 深圳牛津版九年级下册 --Grammar 教学目标 To learn to use it as the empty subject Using it as the empty subject (I) Observe these sentences and think about what it refer to. the time the season the weather the distance the temperature time season weather 代词it可用作主语，表示时间、季节、天气、温度或距离等。如： It is half past twelve. It is spring. It is fine today. 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 o’clock. It is 27 June. It is summer. It is three kilometres. Put the words in the correct order to make meaningful sentences. (P 56) 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) Observe these sentences and think about what it refers to. 形式主语 真正的主语 当句子的主语是动词不定式短语时，一般用代词it 作形式主语放在句首，而将真正的主语动词不定式短语放在句末。如： It is 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. Rewrite the sentences below using it as the empty subject. Practise 1.To learn English well is not easy for him. 2.To study two languages is very hard. 3.To find out the truth is important. It is not easy for him to learn English well. It is very hard to study two languages. It is important to find out the truth. 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 fire in the forest. It is a good idea to take an umbrella. It is nice to have a picnic in the park. it 作为形式主语还常见于It seems / appears 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。 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 happened to her. 早上九点钟。 2. 坚持做完工作很重要。 3. 他们似乎并不想离开。 1. It was nine o’clock in the morning. 2. It’s important to stick with it. 汉译英 3. It seemed that they did not want to leave. It用法总结 it 代词 引导词 构成强调句 人称代词 非人称代词 作形式主语 作形式宾语 一、it用作代词 1．用作人称代词。代替上文中提到过的人、动物或事物。指代人时，一般用于小孩或身份不十分明朗的人。 例如： —What’s that --It’s a puppy. －Who is the baby －It’s my teacher’s son －Who is that gentleman －It’s my friend, Tom． 【 ... ...
