"Conversion" refers to a special operating method or rule used at a particular stage in the process of sentence generation, the deep structure is its input, and the surface structure is its output. "Generation" means that a limited rule system can generate infinite sentences in the language. Language is an infinite collection of sentences, not real things in the real world it is generated by grammar. Grammar is the real thing in the real world, grammar is present in the human brain, is a limited system of rules in the brain.
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