英语必修3Unit4_astrono123my_the_science_of_the_stars_Grammar 2.pptVIP

Noun clauses as the subject and appositive;1. is unknown. 2. is right. 3. remains unknown. 4. is time. 5. hasnt been decided yet.;【归纳总结】 1. 引导主语从句的词有连词that, whether；连接代词who, whose, whom, whoever, what, which等；连接副词where, when, whenever, wherever, how, why等。 2.连词位于句首不能省略。 3. 主语从句后置时引导词that可省略; 4. 主语从句大多数情况下视为第三 人称单数, 但在连接代词what引导 的主语从句后谓语动词的数要根 据句意而定。 When and where the meeting will be held still remain a question. What were your problems a year ago has now become mine. ;5 有时用it作形式主语，将主语从句后置, 这样做是为了避免句子头重脚轻 常用句型如下： It+ be +名词+ that 从句 It+ be + 形容词+ that从句 It+ be + 动词的过去分词+ that从句 It+ 不及物动词+ that从句;1. __________________ (他出生在何地) has not been found. 2. _____________________ (谁会赢得比 赛) is still unknown. 3. ______________ (谁来都) is welcome. 4. ____________________________ (那个 人为什么被谋杀) is still unknown. 5. ________________________________ _______ (我们是否要建新高中) hasn’t been decided. ; 同位语从句 ;2. 同位语从句通常由that引导，但that不在从句中充当成分，也不能省略；同位语从句也可以由whether, when, where, how等引导。如： They raised the question where we should go. ;3. 引导同位语从句表示“是否”时，只能用whether而不用if。 4. 同位语从句与定语从句的区别： ①从词类上区别：同位语从句前面的名词只能是idea, fact, news, hope, belief, suggestion等；而定语从句的先行词可以是名词、代词，也可以是整个句子。;②从性质上区别：同位语从句是名词性从句，其作用相当于一个名词，是对前面的名词作进一步解释、说明；定语从句的作用相当于一个形容词，用来修饰前面的名词、代词或句子。;③从引导词及其在句中的成分上区别:有些引导词如how, whether等可以引导同位语从句, 但不能引导定语从句。定语从句的引导词均在从句中充当特定的句子成分。如: I won’t believe the fact that he lied to his mother. (that引导同位语从句，对fact进行说明, that不充当句子成分。) I won’t believe the fact (that) he told me. (that引导定语从句, 对fact进行限定，that在从句中充当宾语。);I. 在空格处填上适当的词，使下列定语从句和同位语从句完整。;4. The news was very exciting ___ our class had won the football match. 5. They are familiar with the opinion ____ all matter consists of atoms. 6. The question ___________________ we shall have a meeting hasn’t been decided. 7. They told the p