九年级Unit 15 A doctor for animals

九年级Unit 15 A doctor for animals,标签：初三下册英语教案,初中英语教案,http://www.67xuexi.com
① To learn a foreign language is not easy. 学好一门外语不容易。

九年级Unit 15 A doctor for animals由www.67xuexi.com收集及整理,转载请说明出处www.67xuexi.com
② To play in the street is dangerous. 在街上玩很危险。
③ To grow plants is very important. 种些植物很重要。

注意，作主语用的动词不定式常常为it替代放在句子开头，动词不定式(或短语)通常放在谓语后面，但翻译时可不必将it译出来，上面几个句子还可表述为：
① It is not easy to learn a foreign language. 
② It is dangerous to play in the street. 
③ It is important to grow plants. 

如果要说明不定式表示的动作是谁做的，可以在不定式前加一个for引起的短语。
It's important for us to learn a foreign language. 
对我们来说学好一门外语很重要。
It's a little painful to get an injection. 注射有一点疼。
It's not interesting to work in a hospital. 在医院工作不是很有趣。

五、同步练习
　用括号内所给动词的适当形式填空。

　1. I don't know when ______(have) a picnic.

　2. She is very busy today. She has a lot of work ______(do).

　3. It's impossible for us ______(finish) the work in such a short time.

　4. teacher asked us ______(be) careful when we crossed the road.

　5. Last week they went to the farm ______(help) the farmers with their work.

　6. She wants ______(be) a doctor when she grows up.

　7. How long does it take you ______(get) to the factory by bus?

　8. My mother never lets me ______(play) football after lunch.

六、同步练习答案及讲解

　1． to have（这是带有疑问词的动词不定式，在句中做宾语。）

　2． to do（不定式做定语，修饰work。）

　3． to finish（动词不定式做主语。）

　4． to be（不定式做宾语补足语。）

　5． to help（不定式做状语。）

　6． to be（不定式做宾语。）

　7． to get（不定式做主语。）

　8． play（不定式做宾语补足语。有些动词如：let，make，feel，have，hear，see，watch等后面的动词不定式做宾语补足语时，动词不定式省掉to。）

九年级Unit 15 A doctor for animals由www.67xuexi.com收集及整理,转载请说明出处www.67xuexi.com

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