次 is more widely used than 遍, so if you are not sure for now, just use 次, people will understand you. and in many collocations, you should not replace 次 by 遍. but to native speakers, there is a subtle difference between 次and遍, and usually they can tell the nuance of them. 遍 emphasizes the whole process of doing something. the main image comes along with 遍 is that a certain movement is continuous from the beginning to the end. so in many cases it can help you to express your opinions or emotions using 遍. the hidden meaning behind 这部电影我看了三遍 is one watched a movie three times and every time from the beginning to the end, but 看了三次 does not emphasize the watching process at all. now can you tell the nuance between 写了三遍 and 写了三次? yes, when one says 写了三遍, maybe he is fed up with writing 3 times since every time it takes a time, and of course maybe he is not complaining at all, but anyway, the writing process is more or less emphasized when he says 三遍. in fact, in order to use them properly, you need to do a lot of practice, because it's a little tricky even for advanced learners. hope my answer is helpful!

hi, only a small difference between them. That is , when you use 遍, the object can be finished or rather ought to be finished. And then it's the most difficult point, you have to know, there's something you can finish and something you can't. Unfortunately, the regulation here won't help much. You need to read more to find out which to use in different situations. 我去过两次北京. 我每天给她打三次电话. 我见过他几次. --------------------------- 今天的作业是,把这篇文章写三遍. 这部电影很感人, 我已经看过五遍了. There are some other similar words like 回,下,趟, you really need to read more to make it clear.

But what about the famous sentence 再说一遍。can you repeat please? I can't fell the idea of the whole process of doing something. What do you think about it?

次and 遍 may mean the same. But, in modern Chinsese, 次 has become more popular and it phased out the 遍. 我去过北京两次 我每天给她打三次电话 我见过他几次. 今天的作业是,把这篇文章写三遍. 今天的作业是,把这篇文章写三次. 这部电影很感人, 我已经看过五遍了 这部电影很感人, 我已经看过五次了