It means to stay, but there are many cases where the two verbs have a similar meaning... in English as well, no?
The past participle of "essere" and "stare" is the same "stato", and "stare" can be used sometimes as an auxiliary verb in some particular tenses. But I think the safest thing is to remember that it means "to stay".
In case you have some specific examples where you have doubts, please ask.
Ciao, nicolas201181! The imperative form of stare is tu sta/stai, lui/lei stia, noi stiamo, voi state, loro stiano. Here's a link to the stare conjugations on WordReference. http://www.wordreference.com/conj/ItVerbs.aspx?v=stare Buona giornata!
The imperative (l'imperativo) is used to give orders, advice, and exhortations.
Examples: Spiegaci!, = Explain to us!, Girati! = Turn around!, Non tormentarmi = Don't torment me!, Sbrigati = Hurry up!, Chiamami! = Call me!, Scrivimi! = Write me!, Sta' zitto! = Shut up!, Lasciami in pace. = Leave me alone., Mettila dietro. (una bici) = Put it in the back. (a bike), Non dirmelo! = Don't tell me!, Non fare l'innocente. = Don't play innocent., Divertiti! = Enjoy yourself!, Dille di riprendersi. = Tell her to get better., Non preoccuparti. = Don't worry yourself., Calmati! = Calm down!, Digli di chiamarla. = Tell him to call her., Tocca a te! Your turn!, Si accomodi. = Make yourself comfortable., Trascinalo a scuola! = Drag him to school!, Coprimi! = Cover me!, Vattene! = Get out of here!, Concentriamoci. = Let's focus., Tienili! = Keep them!, Finiscila. = Finish it., Prendilo. = Take it., Non farti beccare. = Don't get caught., Lascia perdere! = Let it go! Forget it!, Dimmi quand'è iniziata? = Tell me when it started?, Girati, amico. = Turn around, friend., Non bere. = Don't drink., Aspetta! = Wait!
imperativo presente [stàre] = present imperative [to stay]
sta, stai, sta' [non stàre)] (tu) .......... stay [don't stay] (informal, singular)
stìa (egli) .......... stay (formal, singular)
stiàmo (noi) .......... let's stay
stàte (voi) .......... stay (informal, plural)
stìano (essi) .......... stay (formal, plural)
can someone please help me with this? Duolingo states that "For affirmative commands for "tu," you use the 3rd person singular (the form for lui or lei) in the present for verbs with -ARE ". Once the verb here is "stare", why isn't the imperative "sta a casa!". Is this an exception or am I getting something wrong?
I think that is also correct. Probably it is not included as a valid answer just because they did not think to include an indicative mood translation in a lesson on the imperative. They have also placed their standard indicator of the imperative (!) at the end of the sentence in case there is any doubt that they want an imperative answer.
Although it probably won't appear in the dictionary as a correct translation, some uses of stare can translate into English as "feel". Click on the "stare" button in the following link for examples:
The first hint is usually, but not always, correct and the others are often incorrect in the context of the current exercise as in this case.