This research paper investigates the word gid which is used in Najdi Arabic, a dialect spoken in Najd region in Arabic peninsula. This particle is analyzed syntactically using the recent assumptions of the minimalist program (Chomsky 1993, 1995, and subsequent work). As for the findings, it turns out that gid functions as a head that instantiates its maximal projection above TP and under CP. So, this word is not a property of TP domain nor a CP domain. Due to the fact that this word is only used when a speaker is certain of the propositional content of his/her utterance, we argue that gid is an evidential head that scopes over the tense layer. Furthermore, we argue that gid has an EPP feature, hence the specifier position of the functional phases headed by it must be filled by some element which is the subject. This accounts for the fact that subject must precede gid in declarative sentences. Additionally, gid has [PAST] feature which is uninterpretable and hence must be deleted before the derivation is handed over to the LF following the general lines of feature deletion of Chomsky (1995 and 2005). We argue that the deletion of [PAST] feature is conducted through an Agree operation that is established between gid and the verb. This is why gid comes exclusively with past tense. Otherwise [PAST] feature on gid remains active, leading to the ungrammaticality of the given sentence.