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课件网) Grammar U4 Natural disasters 01 Presentation Grammar it—replace a to-infinitive It seems/appears that… it—the empty subject The time The distance The temperature The season The weather time season weather 在表示时间、季节、天气、距离或温度的表达方式里，用it作形式主语。此时，it 无实际意义但不可以省略。 A. Answer these questions using it as the subject. It’s hot. It’s ten o’clock in the morning. It’s 10 May, 2015. It’s summer now. It is three kilometres. B. Put the words in the correct order to make meaningful sentences. It is time for supper now. It is autumn in Australia now. It is about five kilometres to the park. It was windy yesterday. We can also use it as the empty subject of a sentence to replace a to-infinitive. 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。 Tip： 句型： “It +is +形容词+for+宾语+to do sth” 用法：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。 Eg. 1. It is impossible for me to finish the writing in half an hour. 2. It is strange for her to be late for school. To learn English well is not easy for him. It is not east for him to learn English well. To study two languages is very hard. It is very hard to study two languages. To find out the truth is important. It is important to find out the truth. Rewrite the sentences using it. C.Write a sentence using it and a to-infinitive under each picture below. 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 seems that it is going to rain. It appears that his mother knows the truth. It seems/appears that nobody is paying any attention to the flood. We can also use it as the empty subject in the following sentence pattern: It seems/appears that … it 作形式主语时，常见于 It seems / appears that ... 句型中。 似乎没有一个人相信凯文说的话。 It seemed/ appeared that nobody believed Kevin. 你爸爸似乎并不了解你。 It seemed/ appeared that your father doesn’t understand you. 看样子吉姆不太喜欢我。 It seemed / appeared that Jim doesn’t like me. Translate the sentences below. It seems that a typhoon is coming. It appears that the flight has been cancelled. It seems that something bad has happened to her. 02 Extension extension I dropped my watch and it broke. 1. it指统一事物。 Is it a boy or a girl 是男孩还是女孩 2. it 指性别不明的婴儿或用于确认某人的身份。 It’s too late to go there now. 现在去那儿已经太迟了。 It rained all day yesterday. 昨天下了一天的雨。 3. it 用于指时间、距离、价值、天气等自然现象。 It is hard for him to make up his mind. 他很难下决心。 It was foolish of her to say such a thing. 4.it用作形式主语 （of 用于指人的性格、属性、特征等） It seemed as though he didn’t recognize me. It happened that I was out when he called. 5. it用作形式主语。 it look (seem, appear, happen) ... ...
