When do you use про and when о? (about). Are they synonyms in all contexts?

EDIT: I discovered Usage of "про" instead of "о"


  • No, not in all. You cannot use "про" with "мечтать".
    – Abakan
    Jul 26 '16 at 17:20
  • 1
    Related - Usage of “про” instead of “о”. They mostly are synonyms, but not in all situations.
    – Mr Zak
    Jul 27 '16 at 10:42
  • 1
    Смотрел на ласковые зори, Мечтал про утро впереди И думал: забелеет вскоре Давно забытое в груди… [А. А. Блок. «Когда я вышел -- были зори...»
    – V.V.
    Jul 28 '16 at 4:39

They are basically complete synonyms, but "про что-то" is mostly used in conversation or when imitating oral speech, while "о чём-то" is stylistically more neutral. Also note that "о чём-то" uses different case.


Про is used with case - написать про кого, что? - написать про картину, написать про актрису. О is used with another case - написать о ком, чём? - написать о книге, написать об актрисе.

One subtle grammatical difference is that о should be written as об if vowels follow in the next word почитал о картине, but почитал об актрисе.

They also imply some emotions, which are not easily logically explained. I guess, because people of higher education or/and of more poetical nature tend to use о instead of про. When you say

Они разговаривали о любви

(They spoke about love) it sounds different as when you say

они разговаривали про любовь.

Last phrase implies that love has lower meaning, lake dating etc. On the other hand про is more business-style.

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