**Availability**: I will do a presentation and a Q&A on Zoom on April 17th between 1-2 pm Berlin time. Come and join us via this link: https://zoom.com.cn/j/344425990. Or you can contact me at shumianye@gmail.com.
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**Abstract**: This study aims to derive epistemic bias in A-not-A questions in Mandarin Chinese. More generally, we establish a connection between focus and question bias by assuming the completeness-to-likelihood reasoning.