interlanguage to infiltration by first language and target language rules or forms." The structures
of the interlanguage can be invaded by the learner’s native language, especially when the learner
is placed in a situation that cannot be avoided (i.e. lack of knowledge of the TL). Similarly, in
other situations, the learner may violate or over generalize rules from the TL in his effort to
produce the intended meaning. Both of these processes (native language transfer and
overgeneralization) reflect the basic permeability of interlanguage.