CP; Left periphery (phrase structure) ; FocusP; TopicP; FinP; ForceP; Split CP ; Syntaktische Merkmale; Syntactic features; Full interpretation, principle of; Interpretierbarkeit (Grammatiktheorie) ; Interpretability (theory of grammar) ; Features (synt.) ; Grammatizität; Grammaticalness ; Triggering (second language acquisition) ; Parametrization (second language acquisition) ; Critical period (second language acquisition) ; Alter (Einfluss auf Zweitspracherwerb) ; Age (influence on second language acquisition) ; Ultimate attainment (second language acquisition) ; Near-native competence (second language acquisition) ; AoA; Age of acquisition (second language acquisition) ; Sensitive period (second language acquisition) ; Prolepsis (synt.) ; Stylistic fronting; Fronting, stylistic; Vorfeldbesetzung; Topicalization ; Spanish