高中英语（M3）教学资料-U4 主语从句Grammar.pptVIP

Grammar What part does the underlined part serve as in each sentence? A tree has fallen across the road. You are a student. To find your way can be a problem. Smoking is bad for you. What she said is not yet known. That we shall be late is certain. It is certain that we shall be late. 1.What it was to become was uncertain until between 4.5 and 3.8 billion years ago …L 6 2.It was not clear whether the shape would last or not. L 9 3.What is even more important is that as the earth cooled down, water began to appear on its surface. L 13 4.It was not obvious that water was to be fundamental to the development of life. L 18 5. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases. L 21 6. Why they suddenly disappeared still remains a mystery. L 41 7.So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. L 50 主语从句（Noun Clauses as the Subject） 定义： 用作主语的从句叫主语从句，它是名词性从句之一。引导主语从句的连接词有： 连词： that, whether； 连接代词： who, what和which； 连接副词： when, where, how和why。 Translation: (1)老师今天说的话是十分正确. ____________________________was quite right.? (2)他们是否卖掉这所房子还没有决定。 ___________________________is not yet decided. (3) 谁将去并不重要。 ____________is not important. (4) 我们需要的是更多的练习 ______________is more practice. 由连词that(不可省略)引导的主语从句： 1.他们急需帮助，这是十分明显的。 That they are badly in need of help is quite clear. 这样就构成了下面一些常用句型: 1) It is + adj. / n. +从句 　 It is a pity/shame that... 遗憾的是…… 　 It is possible that... 很可能…… 　 It is unlikely that... 不可能…… 2) It +不及物动词+从句 　 It seems/appears that... 似乎…… 　 It happened that... 碰巧…… 3) It + be +过去分词+从句 　It