o imperativo gá ideia de ordem, de comando. de viver...significa - viva!!!! viva tu viva você

Going on: 2 - IMPERATIVO NEGATIVO - it is formed exactly the same as in "presente do subjuntivo" (conditional sentence), just add "não" (=don't). Presente do subjuntivo: (que) eu viva, tu vivas, ele (a) viva,, nós vivamos, vós vivais, eles (as) vivam. Negative form of the imperative: there is no first person (eu) never! ; não vivas (tu), não viva (ele/ela), não vivamos (nós), não vivais (vós), não vivam (eles/elas). Obs.: In Brazil, we don't use in oral language the pronoun "vós". It is too erudite.And "tu" is used in some regions. Remember that oral, colloquial language is more flexible. In my state people say the pronoun "tu" joining the verb in the form of the third person (ele/ela), e.g. viva (tu) bem!, instead of vive (tu) bem! You know, spoken language doesn't follow the right grammatical rules many times. And the rules for the verb "vivER" are different from other verbs ending in "ar" or "ir", as cantAR and partIR... that's why people get so confused. So, don't concern too much about it, the most important is to be able to communicate. If you still have any doubts, I can try to make myself clearer. Bye-bye!

Well... I hope I can help you... To form the imperative is not so easy, even for portuguese -spoken people. Many native people say it wrongly, mainly in oral language. I'll try to say it in a short way, but according to the correct grammar rules: VERB VIVER: 1 - IMPERATIVO AFIRMATIVO - "tu" and "vós", second person in speech come from simple present, taking final "s" off from the end of the word. Ex.: tu vives (present); vive tu (imperative affirmative); vós viveis (present); vivei vós (imperative aff). You can notice that we don't say the pronoun or we say it after the verb in imperative forms. All other pronouns (eu, ele (a), nós, eles (as) )come from "presente do subjuntivo" (come form = are the same). Ex.: Presente do subjuntivo (= form conditional sentences in english) - (que) eu viva, (que) ele viva, (que) nós vivamos, (que)eles vivam. So, in imperative we say: viva eu; viva ele (a); vivamos nós; vivam eles (as).