six-month course course后有s吗

six-month course course后有s吗 "course" course. A six-month English course for students of all levels at ver over the course of month 和 over a month 有什么区别? six month 与 six-month有区别吗? the course of one's optional course和elective course有什么区别? selective course和optional course有什么区别? which month comes after january _________,of course! the english course must be ( )one month before it begins of course是美语吗