This paper utilizes the corpus application "Chuunagon" to investigate specific examples of the Japanese modality expressions "youda" and "mitaida" within the Nagoya University Conversation Corpus (NUCC). The investigation results reveal that there are only 15 instances of "youda" found, while "mitaida" has 150 instances, indicating a tenfold difference. As a result, it reaffirms the observation made by many researchers that "youda" is primarily used in written language, while "mitaida" is more common in spoken language.Furthermore, this paper examines the preceding words of "youda" and "mitaida" and analyzes their collocations. Although only the word "omotteiru" is found to be common between the two, there is still some level of collocational trend captured between "youda" and "mitaida".