A sentence always provides a complete thought. It has a subject (noun, pronoun) and a predicate (verb, or identity verb), and has end punctuation (period, question mark, or exclamation point).
Examples:
Sentence: John ran around the tree.
Non-sentence: Around the tree very fast.
Sentence: Run! (the understood subject is "you" and it means "you must run")
Non-sentence: Running as fast as he could go. (who?)
Non-sentence: The fastest runner ever to attend the school. (did what?)
Gandhi believed in the power of nonviolence as a means to bring about social and political change.
A sentence which does not have a verb
non living thing in the sentence
It is an imperative sentence.
Yes, it can be said is a command sentence. Tell me is the phrase that is making it a command one.
You can tell that a sentence is part of the author's response by looking at the citation.
"My username is mehtamatics." is a non-mathematical sentence.
I am a non resident in the country of Africa.
Stop the non sequitur now.
he is a nonswimmer
Incarceration is jail time so if a person is given a non-incarceration sentence it could be community service.
A sentence that tells you to do something is called a command sentence.