Section Ⅳ　Grammar & Writing

　　主语从句

　　阅读下列句子，体会黑体部分用法

　　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.

　　2．What is even more important is that as the earth cooled down，water began to appear on its surface.

　　3．It was not immediately obvious that water was to be fundamental to the development of life.

　　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.

　　5．Why they suddenly disappeared still remains a mystery.

　　6．So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.

　　一、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成分，本身无任何意义，只起连接作用，但不可省略。

　　That former Hollywood child star Shirley Temple died upset her fans all over the world.

好莱坞前童星秀兰·邓波儿的离世令她全世界的粉丝感到难过。