This article examines the syntactic aspect of the particle mo, which allows for cases where mo does not link parallel events (also known as non-additive mo or bokashi-no mo). In old Japanese, mo selects a form of verb, which is called kakari-musubi. Similarly, in modern Japanese, non-additive mo selects the sentence type. I argue that non-additive mo phrases are generated higher than the FinP, which belongs to B level within the hierarchical structure ofa sentence (Minami 1974, 1993), and that they concord with the sentence type in ForceP, which belongs to D level. According to Hasegawa (2012), the kakari-musubi shows some similarity to a CP level spec-head agreement. I also argue that non-additive mo phrases move from the specifier of CP (C level) to the specifier of ForeeP, and agree with the [ +LINK] feature of Force head. As a result, while additive mo expands its focus only optionally, non-additive mo expands its focus obligatorily, which causes a difference between additive mo and non-additive mo.