Comma indicates the general pause interval in the middle of a sentence. If there is a pause between the subject and the predicate in a sentence, use a comma. For example, most of the stars we can see are stars.

A period indicates the end of a sentence and the beginning of a new sentence, reminding readers that the expression of this sentence has ended. In addition, the western-style period "(British English: period; ; American English: A period is also called a period. Western-style periods are different from ellipsis in Chinese.

When connecting two sentences with commas, be sure to add conjunctions, because a main sentence cannot have two predicates unless you add conjunctions to turn it into a compound sentence or a main sentence.

If you want to continue writing this sentence, but don't want to add a conjunction, you can also add a sign. These two and a half sentences are not related, but they are still one sentence. Because these two sentences are still one sentence after adding a semicolon, there is no need to add a subject after the semicolon, and a period is needed.

Extended data:

The usage of comma and period are:

1. When the subject of the sentence is long and needs to be emphasized, or there are modal particles after the subject, use commas after the subject. For example, these golden chrysanthemums breathe fresh air in the breeze.

2. Comma is used after related words. Although he doesn't write neatly now, he has made progress.

No matter how long the sentence is, as long as the structure is complete and the meaning is independent, a period should be used after the sentence. Example: Class is over.

Comma writing format: next to the text, placed at the lower right of the text, occupying one cell.

Writing format: the period is next to the text, occupying the lower left corner of the rice grid.

Baidu Encyclopedia-Comma (punctuation)

Baidu Encyclopedia-Period (Language Symbol)