? This is a punctuation mark used to express doubt. In Chinese, a question mark is a punctuation mark used at the end of a sentence to indicate a question. Usually used to ask if the other person knows or understands something.

In linguistics, question mark is also considered as a pragmatic symbol, which can help people to better understand and use language. In dialogue, question marks can be used to guide the process of dialogue and help people communicate better.

Question marks can also be used to emphasize certain words or expressions. In writing, using question marks can highlight the key points and arguments of the article. By using question marks on key sentences, the author can remind readers of the important information expressed by these sentences. In addition, question marks can also be used to emphasize the urgency and importance of a question or argument, thus stimulating readers' thinking and discussion.

In speech, the use of question marks can help the speaker to better convey emotions and attitudes. By using question marks on key words, the speaker can emphasize the tone and make the audience pay more attention to the meaning expressed by these words. At the same time, question marks can also be used to guide the audience's thinking and make them participate in the speech more actively.

Historical background of question mark:

The history of question marks can be traced back to ancient times. In Greek and Roman times, people began to use question marks, but at that time the shape of the question mark was an inverted letter T. Later, with the development of Latin, the question mark gradually evolved into the form we know today.

In the Middle Ages, question marks began to be widely used, especially in churches. The church regards the question mark as a respect and respect for the gods, and believes that the use of the question mark can express doubts and explorations about the gods. This also laid the foundation for the popularization of question marks in European literature and philosophy.

During the Renaissance, question marks began to appear more and more in literary and philosophical works. For example, the Italian poet Dante used a lot of question marks to express his doubts and explorations in his masterpiece The Divine Comedy. At the same time, European philosophers began to use question marks to emphasize their views and problems.

In modern times, question marks have become an indispensable part of our daily life. In written language, question marks can be used to express questions, emphasis, rhetorical questions and so on. In spoken English, question marks can also be used to express feelings such as questions, surprises and rhetorical questions.