英语九年级下册Unit 4 Natural disasters评优课课件ppt

这是一份英语九年级下册Unit 4 Natural disasters评优课课件ppt，文件包含沪教牛津版六三制英语九下Unit4Naturaldisaster第3课时Grammar课件pptx、沪教牛津版六三制英语九下Unit4Naturaldisasters第3课时Grammar教案doc、沪教牛津版六三制英语九下Unit4Naturaldisasters第3课时Grammar分层练习doc等3份课件配套教学资源，其中PPT共35页， 欢迎下载使用。
Learning bjects
Understanding the three uses f it as the empty subject
Use it t refer t the time, seasn, weather, distance and temperature
Use it t replace a t-infinitive
It seems/appears that…
Hw many prnuns it can yu find?
What des it refer t?
It 指代具体事物 (water)
It 没有指代具体的事物
It 没有指代具体的事物。 It 作为形式主语，没有实际语义。
第二个it 指代具体事物 (wrk)
第一个It 没有指代具体的事物
Presentatin
We can use it as the empty subject like this:
It is ne ’clck.It is summer nw.It rained all day.It is nly a five-minute walk frm my hme t the schl.It is ht in this rm.
Using it as the empty subject
It’s nine ’clck in the mrning. My bedrm flr is a pl f water.
A Answer these questins using it as the subject.
It’s ten ’clck in the mrning.
It’s 10 May, 2017.
It’s summer nw.
It is abut 20-minute walk frm my hme t the schl.
B Put the wrds in the crrect rder t make meaningful sentences.
It is time fr supper nw.
It is autumn in Australia nw.
It is abut five kilmetres t the park.
It was windy yesterday.
We can als use it as the empty subject f a sentence t replace a t-infinitive.
It’s imprtant t stick with it.
It tk a lng time t build the huse. It is wrng t pay n attentin t Kevin.It is nt a gd idea t sit arund and wrry abut the fld.
T build the huse tk a lng time.T pay n attentin t Kevin is wrng.T sit arund and wrry abut the fld is nt a gd idea.
In mst cases, we use it at the beginning f the sentence as an empty subject t refer t the infinitive.
It tk a lng time t build the huse. (T build the huse tk a lng time.)
从这里走到白云山顶大约要花一小时。___ ______ abut an hur ___ ______ t the tp f the Baiyun Muntain frm here.
It takes
It is wrng t pay n attentin t Kevin. (T pay n attentin t Kevin is wrng.)
参观广州博物馆对我们很有教育意义。 ________ _______ very educatinal fr us _________ ___________ Guangzhu Museum.
It is
t visit
It is nt a gd idea t sit arund and wrry abut the fld. (T sit arund and wrry abut the fld is nt a gd idea.)
When it was time fr the villagers _______ t market. A. gB. gingC. t gD. went
C Write a sentence using it and a t-infinitive under each picture belw.
It is imprtant t stay calm when there is a fire.
It is dangerus t start a fire in the frest.
It is a gd idea t take an umbrella.
It is nice t have a picnic in the park.
We can als use it as the empty subject in the fllwing sentence pattern:It seems/appears that …
D Put the wrds in brackets in the crrect rder t cmplete the cnversatins.
It seems that a typhn is cming.
It appears that the flight has been cancelled.
It seems that smething bad has happened t her.
1. I drpped my watch and it brke.
it用于上文提到的情况
2. Is it a by r a girl?
it 指性别不明的婴儿或用于确认某人的身份
3. It’s t late t g there nw. It rained all day yesterday.
it 用于指时间、距离、价值、天气等自然现象
4. I find it difficult t d the jb well.
用It作形式主语放到句首， 指代动词不定式，动词的ing形式和主语从句，通常把它们放在谓语动词后，常见句型有： 
It作形式主语常见句型
1. It + 动词 +形容词/名词/过去分词/不及物动+主语从句 It is uncertain whether he can cme back r nt. 
这类不及物动词有: appear, happen, seem等。
It is a questin that whether he will cme. 
这类名词有a pleasure, a fact, a pity, a shame, an hnur, a questin等。
这类名词有annunced, believed, said, reprted, expected, hped, decided, shwn等。
It is reprted that 16 peple were killed in the fld.
It seemed that he didn’t tell the truth. 
2. It + be + adj./n. + (fr sb.) + t d sth.
It’s necessary fr the yung t learn Chinese well.It is time fr yu t g t bed.
此处形容词是描述事物的特性。用于此句型的形容词有: easy, hard, difficult, pssible, bad, gd, imprtant, necessary, exciting, interesting等。
3. It + be + adj. + f sb. + t d sth.
It’s wise f Linda t make up her mind t t learn an instrument. 
这个句型是易丢分句型，此处形容词是描述人的品德、特征。用于此句型的形容词有：kind, nice, wise, plite, friendly, flish, clever, rude, implite, cruel等。
4.  It + takes ( sb )+ 时间（金钱）+ t d sth.
It tk the wrkers three years t finish building the twer. 
( ) 1. In fact ____ is a hard jb fr the plice t keep rder  in an imprtant ftball match.  A. this  B. that  C. there  D. it  ( ) 2. ____ is a fact that English is being accepted as an  internatinal language.  A. There  B. This  C. That  D. It 
一、选择最佳答案填空。
( ) 3. Is ___ necessary t take ff ur shes when we enter the lab? A. everyne  B. this  C. her  D. it ( ) 4. ____ will take yu a lt f time t find him in the crwd.  A. It  B. I  C. We  D. They ( ) 5. It is n use ____ there, the situatin is hpeless nw.   A. t g  B. t be ging   C. ging  D. having gne
( )  7. It is never t late t learn, ____?    A. is it  B. isn’t it C. des it  D. desn’t it  ( ) 8. ___ is knwn t all that Shenzhu VI launched successfully.   A. As B. What  C. It  D. That ( ) 9. ____ is reprted in the newspaper, the Earthquake in East   China's Jiangxi Prvince killed 13 peple.  A. It  B. As  C. That  D. What 
1. 细嚼慢咽是个好习惯。______ _____ a gd habit ____ ______ slwly.2. 我其中一个计划是明年在广州买一套房子。One f my plans _____ _____ _____ a flat in Guangzhu next year.3. 他们花了九年的时间建成港珠澳大桥。____ ______ them nine years ___ ______ the Hng Kng-Zhuhai-Macau Bridge.4. 在一天之内收集那么多书是不可能的。___ ___ impssible ____ _______ s many bks in ne day.
It is t eat
is t buy
It tk t built
二、根据中文意思完成句子
It is t cllect
Finish Grammar exercise paper.
Nature will nt deceive us. It is ften urselves wh deceive us.