In linguistics, modal particles are always uninflected words, and are a type of grammatical particle. Linguistics is the scientific study of Language, encompassing a number of sub-fields In the context of linguistic morphology, an uninflected word is a Word that has no morphological markers ( Inflection) such as Affixes In Linguistics, the term particle is a word lacking a strict definition but has the function of changing the relation of the parts of the sentence to one another and is therefore Their only function is that of reflecting the mood or attitude of the speaker or narrator, in that they are not reflexive but change only the mood of the verb. Grammatical mood is one of a set of distinctive Verb forms that are used to signal modality.