Spoken language is the language used in oral communication and the earliest language form widely used by human beings. All ethnic groups have spoken English. Spoken language is usually transmitted by sound. According to the needs, spoken language is often described by words in literary works.
Spoken English is flexible and changeable, and can be used freely because of different occasions and speakers. Because both the speaker and the listener are on the scene, sometimes this kind of play not only does not affect the listener's understanding, but can more vividly reflect the speaker's mentality.
Or keep the language concise. Compared with spoken language, written language is developed on the basis of spoken language and used for written expression. After spoken language becomes written language, it is more fixed and more rigorous in grammar, which is conducive to accurate circulation.
After a period of time, the difference between spoken and written language tends to intensify, because spoken language changes constantly with time and place, while written language is relatively stable. Educated people will learn from written language and adopt strict grammar in spoken language.
It takes a while for the written language to adapt to the changes in spoken language, otherwise fewer and fewer people will understand the written language. Linguists can study the historical development and changes of language from the differences between written literature and modern spoken language.
There are always some oral expressions that are difficult to use in writing, because only both parties present can understand them, and there is no established standard or even corresponding words (only established pronunciation).
Or, due to the relatively scattered oral structure, such as the lack of language environment, it may cause ambiguity and confusion. Therefore, the more formal the occasion, the more people like to use written language. Spoken English is often accused of being difficult to be elegant.