L1 interference
[/ɛl wʌn ˌɪntərˈfɪrəns/]
noun
interferência da língua materna
1. The negative influence of a learner's first language on their acquisition and use of a second language, resulting in errors or non-native patterns
The student's L1 interference was evident when she used Portuguese word order in her English sentences.
A interferência da língua materna foi evidente quando o aluno usou a ordem das palavras do português em suas frases em inglês.
2. Linguistic phenomena where native language structures, phonemes, or grammatical rules are incorrectly transferred to the target language
Common L1 interference for Brazilian Portuguese speakers learning English includes false cognates and different stress patterns.
A interferência comum da língua materna para falantes de português brasileiro aprendendo inglês inclui falsos cognatos e padrões de acentuação diferentes.
This is primarily an academic and pedagogical term used in linguistics and language education contexts. It's widely discussed in Brazil's English language teaching community and is particularly relevant when teaching English to Portuguese speakers, as the phonological and grammatical differences between Portuguese and English frequently produce observable L1 interference patterns.
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