With the deepening of language research, Chomsky criticized Saussure's basic idea of the mechanical classification of language, and suggested that language is the result of human creative activities. Chomsky distinguishes between language skills and language expression in language, which refers to the knowledge of language regulations that ideal lying native speakers have, who can understand and speak sentences they have never heard before, and who can determine whether they belong to a particular language. Language expression refers to the actual use of language, that is, what is said in real life. People with language skills can understand or generate correct sentences, but because of psychological, physiological and social factors, language performance may also deviate from the grammar rules of behavior, that is, ability errors are related to the learner's language ability, and learning errors are related to the learner's language performance.
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