This paper concerns about how Old English constructions are derived from definitions such as LCA, specificity and C-features(V2) in the minimalist framework (Chomsky 2005, 2006). There are 5 sentence patterns in Old English, which makes it difficult to set up the basic clause structure. Having presented arguments against the existing analyses such as the OV approach or the VO approach or the head parameter approach, this paper argues, on a variety of grounds, that 5 sentence patterns in Old English are actually derived from the interaction of minimalist definitions such as LCA, Specificity and C-features. Assuming Old English clause structure to be a single VP structure like [VP V ...] and modal verbs and main verbs in Old English to be occupied in the same V-position, I show that 5 construction patterns in Old English are the results from the interactions of LCA(which makes modal verbs or main verbs move out of VP), V's specificity(which makes pronouns (object) raise to VP Spec) and C-features (which make objects to move to CP Spec). (Young San University)