“只好”和“只得”是两个用法相近的副词，考察发现，两者都含有被迫意味，即都可表示“不得不”的语义内容。但在语义确信度和主观性方面，“只得”又要高于“只好”。在句法方面，当“只好”与“只得”在“NP+只好/只得”这个结构中的NP是排除式用法、后面是动词性成分、在陈述句和祈使句中及在“把”字句和连谓句兼语句中时，两者是可以互换使用的；当前面有“不好”与之搭配、前后接小句是并列关系和在“被”字句中时，两者不能互换使用。

This paper chooses the synonyms of the same morphemes "Zhi hao" and "Zhi de" as the research objects. Because of the same morphemes, synonyms have certain similarities in morphology. Their interpretation, syntactic structure and usage are similar in some cases, which may cause some confusion. In order to reduce the confusion between the two words, this paper takes the CCL corpus as the source of the corpus and analyzes the semantic features, syntax and pragmatics.