tvirtinu

tvirtinu is a Lithuanian verb form. It is the first-person singular present indicative of the verb tvirtinti, which means to strengthen, fortify, fix in place, or to confirm/substantiate. The form tvirtinu can be used in both physical and abstract senses, reflecting the versatility of the root tvirt- meaning firm or strong.

Etymology and related forms: tvirtinti derives from the Lithuanian root tvirt-, linked to the concept of firmness. Related words include tvirtinimas (the act or result of fastening or fortifying) and tvirtinęs or tvirtinęs (past active participles). The verb belongs to the first conjugation pattern in Lithuanian.

Grammar and usage: As a present tense form, tvirtinu is used when the speaker themselves is performing the action in the present. Its full present tense paradigm is: aš tvirtinu, tu tvirtini, jis/ji tvirtina, mes tvirtiname, jūs tvirtinate, jie tvirtina. The same verb in other tenses appears as tvirtinau (past), tvirtinai, tvirtino, and so on. In passive or impersonal constructions, other forms such as pritvirtinti or tvirtinti puede be used, depending on the exact sense.

Meanings in practice: physically, tvirtinti can mean to fasten, secure, or reinforce components or structures. metaphorically, it means to confirm, substantiate, or assert a claim or statement. For example, Aš tvirtinu savo nuomonę remdamasis įrodymais (I stand by my opinion based on evidence). In scientific or legal contexts, tvirtinti often appears in the sense of establishing or substantiating a fact or conclusion; in construction or engineering, it refers to securing parts or supports.

Notes: In everyday language, tvirtinti the broader sense of securing is common, while more precise terms like pritvirtinti (to attach) or tvirtinti įrodymus (to substantiate evidence) may be used for nuance.