UNIT 5 Section Ⅱ Learning About Language（Word教参）-【优化指导】2023-2024学年新教材高中英语选择性必修第一册（人教版2019）

Section Ⅱ　Learning About Language 主语从句 [对应学生用书P137] [观察] 1．However，what concerned him most was that farmers often had poor harvests and sometimes even had a serious shortage of food to eat. 2．How this could be done was a challenging question at the time. 3．However，whether it was possible to develop a hybrid of self­pollinating plants such as rice was a matter of great debate. 4．Today，it is estimated that about 60 percent of domestic rice consumption in China is comprised of crops generated from Yuan's hybrid strains ... 5．What impressed people most about Yuan Longping was his ongoing ability to fulfill his dreams. [探究] 1．以上黑体部分在句中作主语。 2．句1和句5中的what在从句中作主语。 3．句3中的whether意为“是否”。 4．句4中的it是形式主语，真正的主语是后面的that引导的从句。 5．句2中的how在从句中作状语。 1．什么是主语从句？ 在复合句中充当主语成分的句子叫作主语从句。 2．主语从句的连接词怎么选择？ 主语从句连接词的选择由句意和连接词的意义及其在句中所做的成分决定。 一、定义 [感知] 1．Jim is good at playing the piano. 2．To see is to believe. 3．Smoking is bad for health. 4．What he has said is true. 5．Whether they would support us was still a problem. [探究] 1．句子的主语可以由名词、代词、动词不定式、动词­ing形式和句子等来充当。 2．句子作主语时，要用适当的连接词来引导。 [归纳] 如果一个从句在句子中充当主语，那么这个从句就是主语从句。 主语从句通常放在主句的谓语动词之前，有时也由形式主语it代替，而本身放在句子末尾。 Is it true that he is the girl's father? 他是那个女孩的父亲，是真的吗？ [即练] 用下划线标出下列句子的主语 ①Who will go makes no difference. ②Which book I shall choose hasn't been decided. ③When we will leave hasn't been decided. ④Where the meeting will be held is not known. ⑤It is a pity that she has made such a mistake． 二、连接词的选择 [感知] 1．What we need is more water. 我们需要的是更多的水。 2．Whether we can arrive there on time depends on the traffic. 我们是否能按时到达那里视交通情况而定。 3．When the delayed flight will take off depends much on the weather. 延迟的航班什么时候起飞主要取决于天气状况。 4．Why the man hadn't reported the accident sooner was never clear. 现在还不清楚那个人为什么不早点报告那起事故。 5．Who the letter was from is still unknown. 这封信是谁寄的尚不清楚。 6．That you are coming to London is the best news I have heard this long time. 你将要来伦敦是这么久以来我听到的最好的消息。 [探究] 1．句1中连接代词what在从句中作need的宾语。 2．句2中从属连词whether意为“是否”，在从句中不作成分，只起连接作用。 3．句3中连