"Buy candies, please."
Translation:Купи конфеты, пожалуйста.
‧ Imperative ‧ 'command' form ‧ www.auburn.edu/~mitrege/russian/tutorials/0006.html ‧ masterrussian.com/aa042700b.shtml ‧ duolingo.wikia.com/wiki/Russian_Skill:Imperative ‧ russianlearn.com/grammar/category/the_imperative_mood ‧ www.russianlessons.net/grammar/verbs_aspect.php ‧
Can somebody tell me when to use конфет and whrn конфеты? They seem interchangeable so far.
"Купить" is the infinitive of the verb "to buy". In this sentence you must use the imperative: either "купи" or "купите".
I found a few interesting discussions regarding verb aspects in imperative constructs: http://forum.wordreference.com/threads/2252015/ http://russian.stackexchange.com/q/7329/31057 http://russian.stackexchange.com/q/1512/31057.
My understanding from these discussions is that:
The imperfective aspect (e.g. покупай here) emphasizes the action or the process itself (e.g. "do something"), whereas the perfective aspect (e.g. купи here) emphasizes the outcome (e.g. "get it done").
The imperfective aspect is used for general advice ("always do something"), the perfective is used for specific situations ("do this now").
It seems that occasionally one of the aspects may appear to be more demanding and impolite than the other aspect. I can't say which, because I read conflicting information in the above mentioned discussions. Perhaps it's inconsistent and varies with the actual verbs - I guess some experience and sensitivity is required to speak properly and politely ;)
Read about verb aspects (perfective vs. imperfective, e.g. http://www.russianlessons.net/grammar/verbs_aspect.php ). Покупай is imperfective whereas купи is perfective.