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课件网) Unit 4 Oxford English Module 2 Environmental problems Period 3 Grammar Natural disasters To learn to use it as the empty subject Objective Using it as the empty subject (I) Have A L k It’s nine o’clock in the morning. My bedroom floor is a pool of water. It is one o’clock. It is summer now. It rained all day. It is only a five-minute walk from my home to the school. It is hot in this room. Observe these sentences and think about what it refers 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 Translate the following Chinese sentences into English. 现在是十点十分。 宾馆距离海滩两英里远。 今天早晨下雨了。 今天天气相当暖和。 It’s ten past ten. It’s two miles from the hotel to the beach. It was raining this morning. It’s quite warm today. Answer the questions using it as the subject. (P 55) A It is sunny. It is twelve o’clock. It is February 18th. It is spring. It is five 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) Have A L k My boss has given me some work. It’s important to stick with it. 2. It took a long time to build the house. 3. It is wrong to pay no attention to Kevin. 4. It is not a good idea to sit around and worry about the flood. 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 It + is/was +形容词/名词+ to do sth. Rewrite the sentences below using it as the empty subject. 1.To eat healthily is very important. 2.To study two languages is very hard. 3.To find out the truth is important. It is very important to eat healthily. 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. 注意：有时动词不定式有自己的逻辑主语，常由 “for/of + sb.” 构成。 “It + is/was + adj + (for/of + sb) + to do sth.” ★ (for sb) 若形容词描述事物的特征性质, 如: easy, useful，important, dangerous等 ★ (of sb) 若形容词描述人物的性格品质, 如: kind, polite, nice, careful等 Fill in the blanks with for/of It is impossible ____ me to finish the writing in half an hour. It is not easy ____ him to learn English well. It is clever ____ you to leave at once. It is very kind __ ... ...
