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2020银川英语同步微课免费学单词速记课程,上奇速优课网100%送智能笔记本

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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