2. Underline forms: generally divided into single underline, double underline, bold underline, dotted underline, wavy line, etc.
3. In web pages, the text (hyperlink) that can be linked is usually underlined.
4. The main function of underline is to emphasize words and attract attention.
5. Underline is also often used to fill in the blanks. In language and literature, it is often used as a sign to distinguish the subject, predicate and object of sentence components.
6. Example of underline application:
Such as: _ _ _, or or