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Language transfer: appliance of native language knowledge to a second language.
Interference or negative transfer: errors originated in the application of L1 grammar rules to the construction of L2. The greater the differences between the languages, the more negative transfer will result (false friends).
Interlanguage: linguistic system developed by a learner of a L2 who has not become fully proficient yet but who is approximating to the target language. (Spanglish)