次

次: [Verbal measure word], means once, at a time

1. 次 can not serve as a sentence element in isolation
 

2. 次 is used after numerals or demonstrative pronouns. For example:
 

【 collocation】：一次、两次、 三次…… /  这次、那次

3. 次 is used as complements of verbs to indicate the frequency of actions. For example:
 

（1）他去过两次北京。

（2）我一周上三次汉语课。

4. 次 can also be used before verbs as adverbial adjuncts emphasizing that the action is carried out or completed within a certain number of times. For example:
 

（1）他一次就通过了。

（2）我要一次答对。

5. The reduplication of 次 has the meaning of “every”.
 

【Structure 】: AA —— 次次（=每次）

6. Reduplicated Verbal measure words can often act as the subject in a sentence.
 

（1）次次见他，次次心动。

（2）次次都是第一名。

“都” is generally used before the predicate.

 

7. The quantity phrase overlaps, indicating a large quantity. 一次次 can be used as attributive or adverbial in a sentence. For example:
 

【Structure】：一AA —— 一次次

（1）他一次次摔倒，又总是一次次站起来。

（2）一次次给您添麻烦，真不好意思。

Compare: “次” and “遍”
 

“次” and “遍” are both used to indicate the number of times an act has occurred, but “遍” emphasizes the whole process from the beginning to the end, For example:

（1）这本书很好，我已经看过两遍了。

（2）这个电影我看了三次也没看完一遍。