If, in addition to grammar basics (subject and predicate), there are also secondary members (addition, determining fact), then such offer will be called common. Consider the examples. "It is raining" - an uncommon offer. "It rained today" (a common circumstance), "it Is raining" (extended definition), "Rain on glass" (extended addition) - common sentences.But do not forget that the grammatical basis of a proposal may be not only simple (subject + predicate), but one-piece, when in the presence of only the subject or only the verb. Such suggestions can still be spread. For Example: "Winter!" - uncommon one sentence. But "Early morning!" - this is a common offer, because here the subject is provided with a definition. Or, for example: "it's getting late!" - uncommon offer. However: "the Smell of autumn!" - this is a common sentence, when the verb has a complement.Incomplete sentences, subject or verb missing, but easily recovers logically, can also be common and uncommon. "I love raspberries, and Masha - BlackBerry" - here the sentence, "And Masha - BlackBerry" would be incomplete offerm, but common. Because "BlackBerry" is a complement. Do not confuse the concept of "rare offer" with the concept "simple offer". A simple sentence may contain no more than one grammatical framework, regardless of the presence of minor members. A simple sentence is contrasted to the complex sentence in which such a framework will be few and they will be separated by a comma.We wish you success in your Russian lessons! Now you are unlikely to confuse common and uncommon offers.