为什么once(一次)不用加times six times(六次)就要加TIMES 为什么呢

at different times为什么times要加s in modern times为什么加S several times前面加介词for吗?two times呢? in more recent times,time为什么加s millions of times为什么time要加s at the same times as为什么要加s how many times a week?time为什么要加s? 急!things of the old times.time为什么加s Time怎么用?good times 为什么要加s呢 不是表示时间不可数吗? 这句话中为什么加个times?在句中起着什么作用I have three times as many as you. several times前面必须加介词for吗?two times呢? 为什么用how many times have you read it而不用how many times have yo