“是”字句是现代汉语中一种特殊句式,也叫判断句,是由表示判断的动词“是”和它的宾语组成的动宾短语作谓语的句子。在“是”字句里,动词“是”和宾语没有直接的语义搭配关系,“是”的作用是表示判断的性质,联结主语和宾语,表示主语和宾语之间具有同一关系或从属关系。例如:(1)北京是我国的首都.(2)自学是我们当今造就人才的一条重要途 The word “yes” is a kind of special sentence in modern Chinese, also called judgment sentence. It is a sentence composed of verb phrase composed of verb “yes” and its object as predicate. In the word “yes”, the verb “is” has no direct semantic collocation with the object. The purpose of “yes” is to express the nature of the judgment, to connect the subject with the object, indicating that the subject has the same relationship or subordination with the object. For example: (1) Beijing is the capital of our country (2) Self-study is an important way for us to create talents today