This research is concerned with English middle constructions (henceforth, English middles), which is exemplified by sentences such as "This vase breaks easily". English middles are usually accompanied by for-phrases such as "This book reads easily for Mary". For-phrases in English middles have been treated in linguistic literature; however, the literature has not clarified when and how native speakers of English judge contexts as to where they include the for-phrases to English middles. The aims of this research are: i) to elucidate a syntactic property of for-phrases in English middles, and...