作者:未知 时间:2020-02-27 阅读:( )
1:it 做形式主语,不定式to do 或that 引导的句子做真正的主语
例句: It is important for us to protect environment. 保护环境对我们来说是很重要的。(it 做形式主语,真正的主语是to protect environment)即 to protect environment is important for us 是本句,但这样显得头重脚轻,所以用it 做形式主语.
例句: It is common knowledge that science and technology is the first productive force.( it 做形式主语,that 引导的句子做真正的主语
2:it 做形式宾语,不定式to do 或that 做真正的宾语
例句:He thinks it very hard to master a foreign language.他认为掌握一门外语是很难的。(he做主语,thinks 做谓语,it 做形式宾语,very hard 做宾补,to master a foreign language 做真正的宾语,即He thinks to master a foreign language very hard.
例句:He thinks it very essential that he should have a decent job.他认为他应该有一份体面的工作是很必要的即He thinks that he should have a decent job very essential.
3: it 用于强调句,其结构是it is \was+强调部分+that
例句:It was his carelessness that caused his fatal failure.正是他的粗心导致了他的致命失败。(强调his carelessness,做caused的主语,即强调主语)
例句:It was in the cinema that I came across my former English teacher.在电影院我巧遇我的前任英语老师。(强调地点状语in the cinema)
强调句去除it is 和that 这三个词依然还是完整的句子
4 It引导时间的三种句型
1:It is +一段时间+since 从句(从句用一般过去时)
例句:It is a decade since we became friends.自从我们成为朋友已经有十年了。
2: it was +一段时间+before 从句(从句用一般过去时)
例句:It was several weeks before he found that his precise painting was missing.过了好几周他才发现他的宝贵画不见了。
3 :it will be +一段时间+before 从句(从句用一般现在时)
例句:It will be a long time before China becomes a developed country.在中国成为发达国家之前将需过很长一段时间。
语法单选
1 It is his ability that _________________.
A he has become a general manager B makes him become a general manager
C why he can become a general manager D for which he becomes a general manger
2 ________is very import for her ____________.
A It , has complete her work in time B It , because she has to complete her work in time
C It , to complete her work in time D There , to complete her work in time
3 I think _____________________.
A it is very crucial to save money B it very crucial saving money
C it very crucial save money D it very crucial to save money
4 It was his courage ______________.
A that made him stand out B that he stood out
C why he stood out D helped him stand out
5 It _______ten years __________he became a teacher.
A was , since B is, after
C is, before D is , since
6 It __________many hours __________his mother arrives home.
A will be ,before B is , before
C was , since D will be , before
7 It ___________two years _________he found that he had caught the liver cancer.
A was, before B was,since
C has been ,when D is,before
8 It was ____________that_____________.
A because he spared no efforts to study ,made him become a top student.
B because of his diligence that made him become a top student.
C his diligence ,he became a top student
D his diligence, made him become a top student.
语法填空
1 It is essential for students ________(keep)healthy.
2 I feel ________very necessary for me to help her.
3 It is only in this way _________we can achieve the instant fame.
4 I feel __________very important _______we keep practicing English everyday.
5 It __________two days __________the meeting ends.
6 It _________two weeks _________we knew each other
7 It __________a long time ________we become successful actors.
8 It ___________ five days ________ we arrived in Macao.
答案及解析(单选)
1 B 【 解析】 强调句,因为it is his ability that 强调的是名词his ability ,只能做makes 的主语
2 C 【解析】 it 放句首做形式主语,只能to do 或that 引导的句子做真正的主语
3 D 【解析】it 放think 后做形式宾语,后面to do 做真正的宾语
4 A 【 解析】 强调句,强调主语
5 D 【解析】it is +一段时间+since 从句
6 D 【解析】it will +一段时间+before 从句(从句用一般现在时态)
7 A 【解析】it was +一段时间+before 从句(从句用一般过去时态)
8 D 【解析】强调句 his diligence 做made 的主语
答案及解析(语法填空)
1 to keep 【解析】it 放句首做形式主语,to do 做真正的主语
2 it 【解析】it 放feel 后做形式宾语,to help her 做真正的宾语
3 that 【解析】强调句,强调部分only in this way 做方式状语
4 it ,that 【解析】it 做feel 的形式宾语,后面是句子不是不定式
5 will be ,before【解析】ends 是一般现在时,只适合it will be+一段时间+before 从句
6 is ,since【解析】knew 是一般过去时态,根据意思,只适合it is +一段时间+since 从句
7 will be ,before【解析】become 是一般现在时态,
8 is ,since 【解析】arrived 是一般过去时态
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