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人教版选修六《 Unit 4 Global warming Learning about Language》优秀教学课件
It is a penguin.
It is cold and windy.
We think it impossible for human beings to live in such a severe place.
It is comfortable for penguins to settle down.
It is global warming that causes the penguins’ trouble.
Do you know the use of “it”?
用作人称代词，代表前面提到的人或事物
非人称的it:天气、时间、日期、距离、价值、度量、温度、环境
it 作形式宾语，放在宾语补足语之前。
it作形式主语，用来替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。
It is global warming that causes the penguins’ trouble.
强调句型
What kind of sentence is it？
Global warming has drawn
our attention for decades.
Can we rewrite the sentence with given hint?
Global warming has drawn our attention for decades.
It is our attention that global warming has drawn for decades.
It is global warming that has drawn our attention for decades.
It is for decades that global warming has drawn our attention.
强调句结构是______引导的句子, 强调除______以外的部分，句子结构为______+______+ 被强调部分+ ______ + 句子其他部分。其中 be动词只能用______，强调除谓语以外的句子成分时用______,而强调人时则______.
My discovery
it
谓语
it