(1) Immigrant varieties have developed, such as Toronto's Italese, an interlanguage resulting from three generations of contact between Italian and English.(2) This article seeks to establish connections between two different language contact phenomena, interlanguage and codeswitching.(3) The usual source of crosslinguistic influence in the interlanguage of a person learning a first foreign language is quite obviously his/her L1.(4) the interlanguage of Dutch learners of French(5) The co-authors of this paper considered that EFL students' errors represented a developmental process in which a specific interlanguage (set of characteristic linguistic patterns) would merge.(6) Tutuola writes in an interlanguage (as teachers of second languages call it) of Yoruba and English.