This work explains the types of affixation errors second language learners make when learning English word formation processes, especially derivational and inflectional affixations. The data for the study were collected as primary sources from two secondary schools in Sweden. The data were analyzed with the use of Error Analysis noted by Corder (1967) and the error analysis framework adapted by Ellis et al. (2005, p. 57). The method chosen was to identify, classify, describe,and evaluate derivational and inflectional affixation errors. In total 2,812 answers were retrieved. The results consist of some findings, for example, some of the derivationaland inflectional affixations errors were noticed to be intralingual and interlingual. Also, the nature of the errors issuch that they are either transferred, omissive, additive or substitutive errors. Moreover, the errors were also due to overgeneralization, including substitutionerrors, or additive errors. Previous research findings showedstudents make grammatical errors with letter insertions, letter omission, or substitutionerrors. This study made the same findings as students made errors of letter insertion, letter omission, substitution errors, and errors due to overgeneralization. Some of the most difficult derivational and inflectional affixation errors were also noticed across all the grades.

This essay investigates how mother tongue teachers in Sweden view cross-linguistic influence in the Spanish classroom. It focuses on three areas: the student groups’ linguistic profiles; the evaluation of described/presumed strengths and challenges within Spanish phonology, lexicon and morphosyntax; and perspectives on effective contrastive classroom practices. Six semi-structured interviews were conducted with teachers of Arabic, English, and Somali, which were analyzed phenomenographically. The results showed that the students are generally multilingual in their mother tongue, Swedish, and English, with proficiency varying according to birthplace. Whereas English was considered the main support for English-speaking students, Somali and Arabic students were deemed particularly facilitated by their mother tongue in morphosyntax and Swedish/English in lexicon, while phonology was mixed. Finally, there was consensus that Spanish classroom practices should include comparisons to mother tongues, Swedish, and English, by teachers and/or students. Having some mother tongue knowledge was thus deemed beneficial, albeit not essential, for Spanish teaching. / La presente tesina explora las perspectivas de profesores de lenguas maternas en Suecia hacia la influencia cros-lingüística en la enseñanza de español. Se enfoca en tres áreas: el perfil lingüístico de los estudiantes; la evaluación de fortalezas y desafíos descritos/ presumidos en la fonología, el lexicón y la morfosintaxis español; y las percepciones de buenas prácticas didácticas contrastivas. Se realizaron seis entrevistas con profesores del árabe, el inglés y el somalí, cuales se analizaron fenomenograficamente. Los resultados revelaron un multilingüismo estudiantil general de la lengua materna, el sueco y el inglés, con niveles variando según el país de crianza. Mientras el inglés se consideró el mejor apoyo para los estudiantes ingleses en todas áreas, los estudiantes somalíes y árabes se consideraron más facilitados por la lengua materna en asuntos morfosintácticos y el sueco/inglés en léxico, mientras la fonología resultó mezclada.  Finalmente, se concordó que la enseñanza de español debe incluir comparaciones hacia las lenguas maternas igual que el sueco y el inglés, por estudiantes o/y estudiantes. Consecuentemente, tener conocimientos básicos de lenguas maternas se consideró beneficial, si bien no imprescindible, para enseñar español.