一、注意命题的概念人们在各种活动中，经常要对客观事物的属性作出肯定或否定的判断，命题便由此而生．所谓命题，实际就是判断一件事情的句子．对此大家必须明白两点：一是命题的判断只有两种形式，亦即肯定判断和否定判断，对命题进行判断时一定要泾渭分明，且不可模棱两可? First, pay attention to the concept of proposition People in various activities, often have to make positive or negative judgments on the properties of objective things, the proposition will be born. The so-called proposition is actually a sentence that judges one thing. In this regard, we must understand two things: First, there are only two forms of judgments of propositions, that is, affirmative judgments and negative judgments. When judging propositions, they must be clear and distinct, and they must not be equivocal.