A sentence is a sentence because it has a subject and a verb and punctuation at the end (period, question mark, exclamation point) and is a complete thought or idea. Beyond that, sentences can have more parts of speech added and be long or short.
For example:
Jane swam.
Jane swam in the river.
Needing to get some exercise, Jane swam in the cool water of the river.
In some cases, the subject of the sentence is implied.
For example:
(You) Go and buy the groceries.
(You) Sit down and do your homework.
More information:
A sentence is a sentence because it has a subject (noun or noun phrase), a predicate ( verb) and punctuation as well as the other parts of speech like pronouns ( she, it him, her, they, them) adjectives (describes a nouns), predicates, linking verbs, and compound subjects. All of this combined makes a basic sentence. Without the subject or predicate there isn't a sentence. It needs to be a complete thought or idea to be a sentence.
It is the first sentence of a paragraph which is the topic sentence.
It in symmetry with sentence a is what? What is a sentence with symmetry in it? This sentence with symmetry is symmetry with sentence this.
Who or what the sentence is about is the subject of the sentence.
Who or what the sentence is about is the subject of the sentence.
The subject of a sentence is who or what that sentence is about.
yes
A simple sentence is a sentence with one clause expressing a single thought. This sentence is a simple sentence. This sentence, though similar to the first, is not a simple sentence.
As a question, it can be a sentence, like: A sentence can have one word, and as a question then it can be a sentence: Who?
compound sentence, simple sentence, and complex sentence
a descriptive sentence is a sentence that describes something in one sentence
This is a sentence. A prisoner has to serve the sentence the judge gives him.
the meaning of sentence is sentence