Section Ⅳ Grammar名词性从句——主语从句1 ． ( 教 材 P25)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．(教材 P25)The earth became so violent that it was not clear whether the shape would last or not.3．(教材 P26)What is even more important is that as the earth cooled down, water began to appear on its surface.4．(教材 P26)It was not immediately obvious that water was to be fundamental to the development of life.5．(教材 P26)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.6．(教材 P26)So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.定义在主从复合句中，充当主语的从句叫做主语从句。◆How the earth came into existence remains a mystery to us.地球是如何形成的对我们来说仍然是一个谜。◆It worried the woman that her son was always playing computer games.儿子一直在玩电脑游戏，这让这位女士很担心。引导主语从句的连接词引导主语从句的连接词有三类：从属连词、连接代词和连接副词。1．连接词 that 和 whether/if(1)that 引导的主语从句◆That my parents always treat me as a little child makes me very unhappy.我的父母总是像对待小孩子那样对我让我很不开心。◆That the college will take in more new students this year is true.今年这所大学将招收更多新生是真的。(2)whether/if 引导的主语从句◆Whether he can finish his task on time is of great importance.他是否能按时完成他的任务非常重要。◆Whether the sports meeting will be held is not certain now. 运动会是否将举行现在还不确定。(1)that 在名词性从句中不充当任何成分，无词义，只起连接作用。1(2)whether 在从句中不充当任何成分，起连接作用，意为“是否”，不可省略。【即时演练 1】——用适当的连接词填空①That...
