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1、B4U4-grammar.B4U4-grammar.高一英语高一英语必修四语法主语从句必修四语法主语从句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
2、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。1. 什么是主语从句？2. 有什么引导词可以引导主语从句？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。主语从句就是主语从句就是从句在主句中作主语从句在主句中作主语的名词性从句。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，
3、但不能省只起引导作用，不充当成分，没有意思，但不能省2. 引导主语从句的引导词引导主语从句的引导词1. 什么是主语从句什么是主语从句？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， which， 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(清楚的清楚的).*When 在从句中作状语在从句中作状语2. 引导主
4、语从句的引导词引导主语从句的引导词主语从句语法归纳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 unknown.2. 引导主语从句的引导词引导主语从句的引导词 注意注意: 由由that 引导的主语从句有时为了使句引导的主语从句有时为了使句子结构平衡子结构平衡, 避免避免 “头重脚轻头重脚轻”, 常用常用 it 作作形式主形式主语语, 而把从句放在后面。而把从句放在后面。 例如例如: That he will la
5、te for school is impossible._That they should like each other is natural. _*it为形式主语为形式主语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？主语从句太长时一般如何处理？这样就构成了下面一些常用句型这样就构成了下面一些常用句型: 1) It +be + n. +从句从句 It is a pity that. 遗憾的是遗憾的是 It is a s
6、urprise that令人惊奇的是令人惊奇的是 It is a fact that 是事实是事实 *_(很遗憾很遗憾)we lost the match.*_(这是事实这是事实)he cheated in the exam.It is a pity thatIt is a fact that2) It +be + adj. +从句从句 It is certain that 肯定肯定 It is possible that. 很可能很可能 It is unlikely that. 不可能不可能 It is obvious that 很明显很明显 *_(很可能很可能)she will come
7、back tomorrow.*_(很明显很明显)this measure is effective.It is possible thatIt is obvious that3) It +不及物动词不及物动词(seem/happen/occur) +从句从句 It happened that. 碰巧碰巧 It occurred to me that我突然想起我突然想起 It seems that. 似乎似乎*_(刚好刚好)I came into the office at that time.*_(我突然想起我突然想起)I forget to sent the letter.It happen
8、ed thatIt occurred to me that4) It +过去分词过去分词+从句从句 It is said that. 据说据说 It is known to all that. 众所周知众所周知 It is reported that. 据报道据报道 *_(据报道据报道)20 people were killed in the accident. *_(建议建议)we should eat more vegetable and do more exercise.It is reported thatIt is suggested thatIt is decided that 据
9、决定据决定It is believed that 据认为据认为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.陈述语序陈述语序4.主语从句的主语从句的数数和和语序语序 what引导名词性从句时
10、在从句中引导名词性从句时在从句中充当句子充当句子成分成分,如主语如主语,宾语宾语,表语表语,而而that则不然则不然,它在它在句子中句子中只起连接作用只起连接作用。例如。例如：1. What you said yesterday is right.2. That she is still alive is a puzzle.what 与与 that在引导主语从句时的区别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
11、accident remains unknown.ThatThatThatThatWhatWhat注意注意Practice1._ 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 ha
12、s been announced.What What Whether WhetherWhether That Practice1.我们需要的正是他的勇气和诚实。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。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。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 合并句子He hadnt
13、said anything. It surprised us.How was the building built? It is still a mystery.When he will 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.结束结束
