In some cases, there are some other inserted parts in the sentence except for the six main basic elements of Chinese sentences. The students who got internships in China might be told that the inserted element in the sentence is a relatively special part. Usually speaking, the parenthesis does not act as any sentence part and also has no relationship with the other parts in element. Of course, the place of the parenthesis in the sentence is free which can be placed at the beginning of the sentence of in the end of the sentence and even before the predicate.

However, in the aspect of the expression, the parenthesis is an essential part in the whole sentence to express the complete meanings. It is not inevitable part in sentence structure but has special significance in the context and the semantic representation, which can be indicated in two aspects, the semantization and the context connection function. The scholars and experts have classified the parenthesis into many types. According to the semantic function, it can be divided into seven classifications.

The first type is to indicate the subjective ideas, thoughts and opinions or attitudes. The most frequently seen expressions are 我看、说实在的、说实话、不瞒您说、依我看安定依我之见. For example, you can make sentence like 这个人，我看，不行. Another condition that the students who study in online Chinese Lessons need to know is to express the evaluation and guess. The common inserted parts are 看起来、看来、看样子and说不定. You can say看来，他也不相信你啊！

When you say the patterns like谁知道安定不料, you should know they are used to indicate something unexpected like 到那儿一看，谁知道竟是个骗子. If you want to attract the other party’s attention, you can use 你看、你听and你想想. In addition, we use the parenthesis 据说and据调查to indicate the resource of certain news. 例如and换言之are usually applied to make explanation with examples. To summarize the contents mentioned above, you can use 总之and总的来说.