I googled and I found this.
Poplack's model
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Log in or register now.'s model of code-switching is the best known theory of the underlying grammar of code-switching.
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Log in or register now. In this model, code-switching is subject to two constraints. The free-morpheme constraint stipulates that code-switching cannot occur between a lexical stem and bound morphemes. Essentially, this constraint distinguishes code-switching from borrowing. Generally, borrowing occurs in the lexicon, while code-switching occurs at either the syntax level or the utterance-construction level.
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Log in or register now. The equivalence constraint predicts that switches occur only at points where the surface structures of the languages coincide, or between sentence elements that are normally ordered in the same way by each individual grammar.
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Log in or register now. For example, the sentence: "I like you porque eres simpático" ("I like you because you are nice") is allowed because it obeys the syntactic rules of both Spanish and English.
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Log in or register now. Cases like the noun phrases the casa white and the blanca house are ruled out because the combinations are ungrammatical in at least one of the languages involved. Spanish noun phrases are made up of determiners, then nouns, then adjectives, while the adjectives come before the nouns in English noun phrases. The casa white is ruled out by the equivalence constraint because it does not obey the syntactic rules of English, and the blanca house is ruled out because it does not follow the syntactic rules of Spanish.
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Your topic is quite interesting TS. update us on your findings/conclusion, I personally love this kind of topic.