A linguistic system a second language learner develops who has not yet mastered L2 describes what concept?

• A. Language Acquisition
• B. Bics
• C. Language Learning
• D. Interlanguage

Answer: (D)

The main idea here is recognizing the learner’s evolving internal linguistic system as they try to reach proficiency in the second language. This evolving system is called interlanguage. It’s the learner’s current hypothesis about how the language works, shaped by elements of their first language, previous exposure, and attempts to apply rules they’ve started to notice in the target language. It isn’t the same as the learner’s L1 or the fully mastered L2; it sits in between and changes over time as more input and feedback come in. Because interlanguage is still under construction, it often shows systematic patterns and errors—patterns that reflect transfer from the first language and the overgeneralization of L2 rules. As learners encounter more correct usage and receive feedback, their interlanguage gradually moves closer to the target language, though sometimes it can fossilize and stop changing. This is why interlanguage is the best description for a linguistic system a learner develops before mastering the second language.