第6讲 名词性从句 精讲精练 2022届准高三高考英语语法暑假专练

第六讲 名词性从句 主语从句 教材原句语法体现 写出that/what/whether所引导的从句在主句中充当的成分及引导词的功能。 1．What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. (what引导主语从句，并在从句中充当表语) 2．The earth became so violent that it was not clear whether the shape would last or not. (whether引导主语从句，在从句中不充当成分) 3．What is even more important is that as the earth cooled down, water began to appear on its surface. (what引导主语从句，并在从句中充当主语) 4．What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas. (what引导主语从句，并在从句中充当宾语) 5．It was not immediately obvious that water was to be fundamental to the development of life. (that引导主语从句，在从句中不充当成分) 6．So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. (第一个whether引导主语从句；第二个whether引导宾语从句) 基础扫盲 (一)定义 在主从复合句中，充当主语的从句，即为主语从句。 (二)引导主语从句的词及其在句中的功能 1．连接词that和whether/if。 that引导从句，that在从句