Commas divide sentences into meaning groups, indicating pauses less than semicolons and greater than pauses. Comma is the most frequently used punctuation mark in Chinese and most foreign languages, and it is a special case that Korean uses more periods than commas. Comma is the most widely used and flexible, so it is also the most difficult to master.
Extended data:
Chinese usage
1. If there is a pause between the subject and the predicate in the sentence, use a comma.
For example, most of the stars we can see are stars.
If there is a pause between the verb and the object in the sentence, use a comma.
For example, it should be noted that science needs a person to contribute his life's energy.
If you need to pause after the adverbial in the sentence, use a comma.
He is no stranger to this city.
4. Pauses between clauses in complex sentences should be comma, except sometimes semicolon.
For example, it is said that there are more than 100 gardens in Suzhou, but I have been to more than a dozen.
5. Used to separate words in a sentence or to indicate a pause in tone.
Tip: ","cannot be placed at the beginning of a line or at the beginning of a line.
6. When there are modal auxiliary words such as "ah", "ya" and "la" between coordinate words, use commas between coordinate elements instead of pause.
For example, the streets in August are full of fruits, such as melons, watermelons, apples and grapes. ......
7. When the coordinate components are used as predicates, if the coordinate components are subject-predicate structures, then commas are used between the coordinate components.
For example, her clothes are fashionable and eye-catching, her hair is ear-high, she walks briskly and speaks loudly.
Baidu encyclopedia-comma