人教新课标必修三 Unit 4 Astronomy Grammar课件.pptVIP

Unit4 Grammar 名词性从句之主语从句 Ma Dan dan 2011-4-15 1.了解并掌握主语从句的相关概念 2.完成与主语从句相关的练习 3.重点：It 做形式主语的各种句式及虚拟语气的使用。 4. 难点：引导主语从句的连接词的使用。 Turn to page 53 in your workbook and see note 1，2. 学习任务： 1.了解主语从句的定义 2.掌握引导主语从句的连接词的用法。 定义： 用作主语的从句叫主语从句，它是名词性从句之一。引导主语从句的连接词有： 连词that, whether； 连接代词who, what和which； 连接副词when, where, how和why. if可以引导主语从句,但不能用于句首,而应该放在句尾, 用it做形式主语. whether与If做“是否”讲引导名词从句, 区别如下: If 1.不能用在句首 2.不能引导主,表,同从句 3.可以引导宾语从句,但不用在介词之后 连接代词，也称疑问代词。一共九个,包括： who, whom, whose, what, which, whoever, whomever, whatever ，whichever, 代词相当于名词，因此，连接代词在主语从句中可做主宾表同。 2.凡是这里说的话都应当必威体育官网网址。 _______ was said here must be kept secret. 3.凡犯了错误的人都必须改正。 _______ makes mistakes must correct them. 问题： 1.whenever/wherever能引导主语从句吗？ 4.老师今天说的话是十分正确的。 _______the teacher said today was quite right. 5.他们急需帮助，这是十分明显的。 _______ they are badly in need of help is quite clear. 引导主语从句时，什么情况下用that，什么情况下用what？ 小提示： 由连词that引起的主语从句,这类句子在大多数情况下会放到整个句子的后部去，而用代词it作形式主语。 Continue to look at note 4 1) It is + adj. / n. +从句 　 It is a pity/shame that... 遗憾的是…… 　 It is possible that... 很可能…… 　 It is unlikely that... 不可能…… 2) It +不及物动词+从句 　 It seems/appears that... 似乎…… 　 It happened that... 碰巧…… 3) It + be +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…… 　　It is believed that... 据信……;人们相信…… 　　It is suggested that... 有人建议…… Continue to look at 5 特殊强调: 用于It is +important / natural / necessary / impossible /或表示建议要求命令的词的过去分词+that...句型中, 主语从句应使用虚拟语气, 谓语动词用\“should + 动词原形”的形式。 1. _____ he said at the meeting astonished everybody present. 2. ________ the 2000 Olympic Games will be held in Beijing is not known yet. 3. ________ we’ll go camping tomorrow depends on the weather. 4. ________ leaves the room last ought to turn off the lights. 1. The other day, my brother drove his car down the street at __ I thought was a dangerous speed. (2004 上海 春 38) A. as