BUgrammar高一英语必修四语法主语从句.pptx

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1、1)That he will succeed is certain.2)Whether he will go there is not known.3)What he said is not true.4)How we can help the twins will be discussed at the meeting.5)It is important that we should study hard.划出下面句子的主语并思考它们有什么共同点思考题共同点：都是在复共同点：都是在复合句中充当主语的合句中充当主语的从句。从句。第1页/共18页1.什么是主语从句？2.有什么引导词可以引导主语从

2、句？3.主语从句太长时一般如何处理？4.主语从句的数和语序是怎样的？思考题主语从句第2页/共18页语法归纳1)由that引导的主语从句that没有实在意义，不充当句子成分。主语从句就是从句在主句中作主语的名词性从句。How we can help the twins will be discussed at the meeting.That she left him hurts him so much.*that 只起引导作用，不充当成分，没有意思，但不能省2.引导主语从句的引导词1.什么是主语从句？第3页/共18页主语从句语法归纳2)由wh-疑问词和how引导的主语从句用who，whom，w

3、hich，whose，what，when，where，why，how，whoever，whatever等词引导的主语从句相当于特殊疑问句，连接词都在从句中充当一定的成分，包含意思，不能省略。注意句子要用陈述语序。When we will begin the meeting is clear(清楚的).*When 在从句中作状语2.引导主语从句的引导词第4页/共18页主语从句语法归纳3)由whether引导的主语从句 whether不充当句子成分，表示“是否”，一般可以和or，or not 连用。但if不能引导 主语从句放在主句句首。Whether I can pass the exam is

4、unknown.2.引导主语从句的引导词第5页/共18页 注意:由that 引导的主语从句有时为了使句子结构平衡,避免“头重脚轻”,常用 it 作形式主语,而把从句放在后面。例如:That he will late for school is impossible._That they should like each other is natural._*it为形式主语It is natural that they should like each other.It is impossible that he will late for school.3.主语从句太长时一般如何处理？第6页/

5、共18页这样就构成了下面一些常用句型:1)It+be+n.+从句 It is a pity that.遗憾的是 It is a surprise that令人惊奇的是 It is a fact that 是事实 *_(很遗憾)we lost the match.*_(这是事实)he cheated in the exam.It is a pity thatIt is a fact that第7页/共18页2)It+be+adj.+从句 It is certain that 肯定 It is possible that.很可能 It is unlikely that.不可能 It is obvi

6、ous that 很明显 *_(很可能)she will come back tomorrow.*_(很明显)this measure is effective.It is possible thatIt is obvious that第8页/共18页3)It+不及物动词(seem/happen/occur)+从句 It happened that.碰巧 It occurred to me that我突然想起 It seems that.似乎*_(刚好)I came into the office at that time.*_(我突然想起)I forget to sent the lette

7、r.It happened thatIt occurred to me that第9页/共18页4)It+过去分词+从句 It is said that.据说 It is known to all that.众所周知 It is reported that.据报道*_(据报道)20 people were killed in the accident.*_(建议)we should eat more vegetable and do more exercise.It is reported thatIt is suggested thatIt is decided that 据决定It is

8、believed that 据认为第10页/共18页a.When will the meeting begin?b.It has not been decided.When the meeting will begin has not been decided.When they will start and where they go have not been decided.When and where the meeting will begin has not been decided.陈述语序4.主语从句的数和语序第11页/共18页 what引导名词性从句时在从句中充当句子成分,如

9、主语,宾语,表语,而that则不然,它在句子中只起连接作用。例如：1.What you said yesterday is right.2.That she is still alive is a puzzle.what 与 that在引导主语从句时的区别1)_ she is still alive is a consolation（安慰）（安慰）.2)_ he lost the bike worried him a lot.3)_ caused the accident remains unknown.ThatThatThatThatWhatWhat注意第13页/共18页Practice1.

10、_ we need is more time.2._he said at meeting is important.3._ he can pass the exam remains a question.=It remains a question _he can pass the exam.4._well go camping tomorrow depends on the weather.5._we will have an exam next month has been announced.What What Whether WhetherWhether That 第14页/共18页P

11、ractice1.我们需要的正是他的勇气和诚实。_is his bravery and honesty.2.他什么时候来公司还不清楚。_is still unknown.3.昨晚发生了什么仍然是个迷。_is still a mystery.What we need When he will come to the companyWhat happened last night 第15页/共18页合并句子He hadnt said anything.It surprised us.How was the building built?It is still a mystery.When he w

12、ill be back?It depends on the weather.We should keep a balanced diet.It is important.That he hadnt said anything surprised us.How was the building built is still a mystery.When he will be back depends on the weather.It is important that we should keep a balanced diet.第16页/共18页第17页/共18页感谢您的观赏！第18页/共18页