Unit 4 Breaking boundaries Period 2 Grammar 学案- 2023-2024学年高中英语外研版（2019）选择性必修第二册

Unit 4 Period 2 Grammar 【学习目标】 Learning Objectives 1 To know the usage of it as an empty subject 2 To use it as an empty subject correctly 【学习过程】 Learning activities 目标一: To know the usage of it as an empty subject Activity 1: Look at the sentences and answer the questions. Sentence (a) and (c) are from the reading passage. a But it is vital not to take any chances. b But not to take any chances is vital. c It is important to remember that Ebola doesn’t respect national boundaries. d To remember that Ebola doesn’t respect national boundaries is important. 1 What does “it” refer to in the sentences (a) and (c)? 2 What is the difference between the sentences in each group? Why does the author choose to use sentences (a) and (c) instead of (b) and (d)? Answers: _______________________________________________________________________________ _______________________________________________________________________________ Now look for more sentences with this structure in the reading passage, and summarise its uses in your own words. _______________________________________________________________________________ _______________________________________________________________________________ Activity 2: Read the following sentences and summarise what it as an empty subject is. 1 I felt it was my duty as a doctor to go there and offer my help. 2. It is so inspiring to have colleagues like Wilton, Maisy, Alfonso, not to mention all the others I have worked with. 3. In a world still facing so many problems, it is absolutely essential for us all to collaborate to create a global community with a shared future of peace and prosperity. _______________________________________________________________________________ _______________________________________________________________________________ Activity 3: Read the following sentences and summarise what it as an empty subject is instead of. It is necessary to learn English well. It is no use crying at spilt milk. It is