How do I determine whether to use 次 (cì) or 遍 (biàn) in these sentences? 次 seems to be saying that how many times you started to do something, but not quite care about how it persists In 2), the full action is required (from begin to end) so it is 遍。 In 3), the first blank, if he did twice consecutively, then it is 一次, but 两遍 Each 遍 is the full process from begin to end