2019新人教高中英语选择性必修四
Unit3 Sea Exploration
Learning about Language公开课学案
学习目标:
1.To identify the functions of infinitives.
2.To practise using infinitives in different contexts.
3.To express your own ideas using infinitives.
Part Ⅰ Observe and analyse
Find all the sentences containing infinitives in the reading passage. Then mark their functions.
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Part龙湾论坛 Ⅱ　Practise using the infinitive
Activity 1 Join the words to make sentences using infinitives. Then decide the function of each infinitive.
1.He/encouraged me/participate in the surfing competition.
2.The storm/seems/be getting closer.
3.Magellan/was the first person/sail around the world.
4.The UN peacekeeping force/aims/maintain peace and prevent armed conflicts.
5.The crowd/stood/applaud/scientists/for their important ocean research work.
6.It is a good idea/tax/plastic bottles/so that people use them less.
7.The Jiaolong manned submersible/is said/be able/reach 7 km underwater.
8.It remains/be seen/whether or not his capsule can work.
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Activity 2 
Read the beginning of The Little Mermaid and use the proper forms of the汽车保险买哪家好 verbs in brackets to fill in长安cs75价格 the blanks.
Far out in the ocean,where the water is as clear as glass,lives the Sea King. The ocean is too deep     (measure).We may imagine there is nothing except yellow sand under the sea,but actually it is not rare    (see) the most unique flowers and plants    (dance) in the fast-moving water.In the deepest spot of all stands the Sea King’s castle,which has walls of coral and a roof    (form) of beautiful shells.The mother of the king,a wise woman who is proud    (be) born into the royal family,takes care of his six daughters.Among the six sea-princesses,the youngest is the prettiest.Although she has delicate skin like a rose-lea
f and eyes as blue as the deepest sea,she has no feet but a fish tail just like her sisters.The most common way for the princesses    (play) all day long is     (swim) in the halls of the castle or among the flowers growing out of the walls,feeding and touching the fish    (swim) up to their hands through the windows.They seem    (not worry) about anything,except for the  
Activity 3 Read the beginning of The Little Mermaid once again and continue to write what will happen next.
They seem not to worry about anything except for the youngest, who______________________________________________________________________________________________________________________________________
途观l2020款价格图片Activity 4 Complete the news report below with the appropriate forms of the唐山限行 verbs in brackets.
Across northern Africa, the desert is steadily growing. Dry lands are spreading. But a bold project known as the Great Green Wall aims 1内饰清洗.    (stop) the growth of the desert. The am
bitious program includes plans 2.    (help) protect and maintain resources and fight poverty. 
Farmers are learning 3.    (care) for their land and use water wisely. They are also planting millions of trees and crops. The Great Green Wall would cover 4.    area more than 4,000 miles wide. The program receives support from the United Nations, the World Bank and other groups. 
The Great Green Wall’s trees provide a barrier 5.    desert winds and help hold moisture in the air and soil, allowing crops 6.    (grow).More resources will bring more jobs. “The goal is to create sustainable land management,” said Nora Berrahmouni, a forestry officer 7.    works with the Food and Agriculture Organisation of the United Nations. 
Trees and crops have been planted in Senegal and Niger. An 8.    (add) benefit of the Great Green Wall is 9.    countries in the region are sharing information about which programs work and which don’t. Now, along with trees, 10._    (idea) are taking root. 
Part Ⅲ　Language use
Write a paragraph with any topic using infinitives and v.-ing form.
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________