5）反证法从反面来论证由主题句提出的观点，用反面的事实来证明某一观点的正确性，使自已的论述更有说服力，也利于段落的展开。例如：
5）反证法 从反面来论证由主题句提出的观点，用反 面的事实来证明某一观点的正确性，使自己的 论述更有说服力，也利于段落的展开。例如：
Electricity plays a very important part to our modernsociety. A world without electricity will be a terrible oneFactories have to be closed because ofpower failure.Busy trafficlines will be in a state of chaos and suffer from great lossMoreover, modern communication systems will fall apart andpeople will find it hard to get information on time. Also, it willbe impossible for us to enjoy the convenience and entertainmentin our daily life. Such a world will look like a hell.Anotherexample:
Electricity plays a very important part to our modern society. A world without electricity will be a terrible one. Factories have to be closed because of power failure. Busy traffic lines will be in a state of chaos and suffer from great loss. Moreover, modern communication systems will fall apart and people will find it hard to get information on time. Also, it will be impossible for us to enjoy the convenience and entertainment in our daily life. Such a world will look like a hell. Another example：
Naturally everyone expects to be perfect. But unfortunatelythere is no one who never makes mistakes. and no one is to beblamed unless he refuses to learn from them. Many young peoplebecome discouraged when they recognize in themselves qualitiesthat they do not like--bad temper, selfishness, laziness and otherunpleasant things. Just remember that we all have some of thesefaults and have to fight to overcome them. So one must learn notto be too unhappy when he makes a mistake
Naturally everyone expects to be perfect. But unfortunately there is no one who never makes mistakes, and no one is to be blamed unless he refuses to learn from them. Many young people become discouraged when they recognize in themselves qualities that they do not like—bad temper, selfishness, laziness and other unpleasant things. Just remember that we all have some of these faults and have to fight to overcome them. So one must learn not to be too unhappy when he makes a mistake
实战训练：根据汉语提示写出每段的主题句并就如何扩展段落写出关键词（短语）TheImportanceof confidence1.凡事都要有信心2．缺乏信心的原因3.树立信心是可能的
The Importance of confidence 1．凡事都要有信心 2．缺乏信心的原因 3．树立信心是可能的 实战训练：根据汉语提示写出每段的主题句并就如何扩展段落 写出关键词（短语）
1. No one will succeed in doing things withoutconfidence.a. encourage us to face any difficultyb. the study of English (example)c. job interview (example)
1. No one will succeed in doing things without confidence. a. encourage us to face any difficulty b. the study of English (example) c. job interview (example)