What are the usages of four words in English?

Say is generally used as a transitive verb, focusing on the content of the speech. Its object can be a noun, pronoun or object clause. For example, he will say his name. He will say his name.

Speak emphasizes action, not content. When acting as a transitive verb, it often takes a certain language as the object. When acting as intransitive verbs, the common collocation forms are: speak of something/ someone talking about something (someone) speak to sb and talk to someone. In addition, speak can also be used to perform or give speeches in more formal occasions. Can you speak Japanese? Can you speak Japanese?

Talk is usually an intransitive verb, meaning "talk, talk, and emphasize the mutual conversation between two people." She is talking with Lucy in English. She is talking with Lucy in English.

Tell is often used as a transitive verb, meaning "tell, tell", and the verb is often followed by a double object. Tell sb. something.

English, belonging to the West Germanic branch of the Germanic family of Indo-European languages, evolved from the languages spoken by Germanic people of Anglo-Saxon and Jute tribes who immigrated to the British Isles from Scandinavia, Germany, the Netherlands and surrounding areas, and spread to all parts of the world through active British colonization. Due to the contact with many national languages in history, its vocabulary has changed from monism to pluralism, its grammar has changed from "more inflections" to "less inflections", and its pronunciation has changed regularly. According to the number of native English speakers, English is the official language of the most used countries, the most widely used second language in the world, and the official language of the European Union, the largest number of international organizations and Commonwealth countries. The number of native English speakers ranks third in the world, after China and Spain. 19 From the 20th century, Britain and the United States were the world leaders in culture, economy, military affairs, politics and science, which made English an international language. Nowadays, English is used as a medium of communication in many international situations. English is also the language most closely related to computers. Most programming languages are related to English. With the use of the Internet, English is more widely used. English is one of the working languages of the United Nations.