非谓语动词作主语和非谓语动词作表语
1) 非谓语动词作主语
作主语的可以是不定式和动名词。
非谓语动词 用法
不定式 往往表示一次性的、具体的动作；表目的。
常用it作形式主语，而把不定式后置。
动名词 表示一般或抽象的行为。
有时也可用it作形式主语，但仅限于几个句型。
It is a great honor to be invited to speak here.
受邀请在这发言是个荣幸。
Playing the piano is my hobby.
弹钢琴是我的爱好。
It is no good telling him the news.

告诉他这个消息没有好处。

不背单词电脑版
囧记单词
新概念英语青少版

注意
it作形式主语代替动名词常出现在It is no use/good doing..., It is useful doing..., It is a waste of time doing...等句式里。
2) 非谓语动词作表语
作表语的可以是不定式、动名词、现在分词和过去分词。
非谓语动词 用法
不定式 表示某一特定行为，尤其是将来的或有待实现的行为
动名词 不强调动作，只说明动作的名称，或主语的内容
现在分词 表示主语具有的特征
过去分词 表示主语的感受或所处的状态
My wish is to be a scientist.
我的愿望是当科学家。
The most important thing is to put the theory into practice.
最重要的事情是要把理论同实践相结合。
What she likes is watching the children play.
她喜欢做的事是看孩子们玩。
The reason he gave was very convincing.
他给的理由有说服力。
He is shocked at what happened to his son.
他对发生在他儿子身上的事很震惊。

What makes a person a scientist？Does he have ways or tools of learning that are different from those of others？The answer is “no”．It isn't the tools a scientist uses but how he uses these tools which makes him a scientist．You will probably agree that knowing how to use a power is important to a carpenter．You will probably agree，too，that knowing how to investigate，how to discover information，is important to everyone．The scientist，however，goes one step further；he must be sure that he has a reasonable answer to his questions and that his answer he gets to many questions is into a large set of ideas about how the world works．
The scientist's knowledge must be exact．There's no room for half right or right just half the time．He must be as nearly right as the conditions permit．What works under one set of conditions at one time must work under the same conditions at other times．If the conditions are different，any changes the scientist observes in a demonstration must be explained by the changes in the conditions．
This is one reason why investigations are important in science．Albert Einstein，who developed the Theory of Relativity，arrived at this theory through mathematics．The accuracy of his mathematics was later tested through investigation．Einstein's ideas were proved to be correct．A scientist uses many tools for measurements．Then the measurements are used to make mathematical calculations that may test his investigations．
1．What makes a scientist according to the passage？
A．The tools he uses．            B．His ways of learning．
C．The way he uses his tools．     D．The various tools he uses．
2．“…knowing how to investigate，how to discover information，is important to everyone．”The writer says this to show_______．
A．the importance of information
B．the difference between scientists and ordinary people
C．the importance of thinking
D．the difference between carpenters and ordinary people
3．A sound scientific theory should be one that_______．
A．works under one set of conditions at one time and also works under the same conditions at other times
B．leaves no room for improvement
C．doesn't allow any change even under different conditions
D．can be used for many purposes
4．What is the main idea of the passage？
A．Scientists are different from ordinary people．
B．The Theory of Relativity．
C．Exactness is the core of science．
D．Exactness and way of using tools are the keys to making of a scientist．

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