Grammatizität; Grammaticalness ; Cross-linguistic influence (psycholing.) ; Language loss (biling.) ; Attrition (biling.) ; Language attrition (biling.) ; Reacquisition (biling.) ; Sprachbewahrung; Ethnolinguistic vitality; Vitality, ethnolinguistic; Sprachwechsel; Language shift; Heritage language; Language maintenance ; Bilingual education ; Third language acquisition ; Swedish ; Other varieties of Spanish