According to their structure, simple sentences are divided into: one-member and two-member sentences. One-Member Sentences A one-member sentence is a sentence having only one member which is neither the subject nor the predicate. This does not mean, however, that the other member is missing, for the one member makes the sense complete. One-member sentences are generally used in descriptions and in emotional speech. If the main part of a one-member sentence is expressed by a noun, the sentence is called nominal. The noun may be modified by attributes, Dusk — of a summer night. (Dreiser) [...]

Simple sentences, both two-member and one-member, can be divided into below categories based on their complexity: Unextended Extended Extended Simple Sentences A sentence consisting only of the primary or principal parts is called an unextended sentence. She is a student. Birds fly. Winter! Extended Simple Sentences An extended sentence is a sentence consisting of the subject, the predicate and one or more secondary parts (objects, attributes, or adverbial modifiers). The two native women stole furtive glances at Sarie. (Abrahams) The two white overseers... had gone into the hills with the natives to look for stray sheep. (Abrahams) [...]