Unit 7 Section 4 Grammar—名词从句(主语从句、宾语从句和表语从句)-【赢在微点】轻松课堂2023-2024学年新教材高中英语必修第三册（北师大版）

Section 4　Grammar—名词从句(主语从句、宾语从句和表语从句) 先会观察　　悟考点 课前观察　　自主领悟 语法图解 观察句子 ①What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. ②The earth became so violent that it was not clear whether the shape would last or not. ③What is even more important is that as the earth cooled down, water began to appear on its surface. ④It was not immediately obvious that water was to be fundamental to the development of life. ⑤What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas. ⑥So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. ⑦Exactly when the first people arrived in what we now know as California, no one really knows. ⑧We all believed that he would be back in two hours. ⑨That's why today over 40% of Californians speak Spanish as a first or second language. ⑩Mary was late for school. It's because her mother was ill. 我的领悟 1．句①中的what在从句中作表语，句③中what在从句中作主语，句⑤中的what在从句中作宾语。 2．句②，⑥中的whether意为是否。 3．句④中的It是形式主语，真正的主语是 that water was to be fundamental to the development of life。 4．句⑦中的what引导宾语从句。 5．句⑧中的that引导宾语从句，可以省略。 6．句⑨中的why和句⑩中的because引导表语从句，不可省略。 精讲细点　　通语法 语法课堂　　高效学习 主语从句 一、定义 在主从复合句中充当主语的从句即为主语从句。 ①What made people excited was that the solar ship had completed its around­the­world trip. 让人们激动的是太阳能船已完成了环游世界的旅行。 ②It worried the woman that her son was always playing computer games. 儿子一直在玩电脑游戏，这让这个女人很担心。 二、主语从句的连接词及其句法功能 1．连接词that和whether/if (1)that在从句中不充当任何句子成分，本身无任何意义，只起连接作用，但不可省略。 That she survived the accident is a miracle. 她在事故中幸免于难简直是个奇迹。 (2)whether/if在从句中不充当任何句子成分，起连接作用，意为“是否”，不可省略。 Whether the plan will be carried out is still unknown. ＝It is still unknown if/whether the plan will be carried out. 这个计划是否会实施还不知道。 注意　whether引导的主语从句既可放在句首也可放在句中，但if引导的主语从句只能放在句中，前面需用it作形式主语。 【小练1】　完成句子 ①That she could come to help us made us very happy. 她能来帮助我们使我们很高兴