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?)
Nonviolence for the children of the World. Tell me if this was a better sentence!
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.
I am a non resident in the country of Africa.
"My username is mehtamatics." is a non-mathematical sentence.
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.
A Concluding Sentence is the last sentence of a paragraph(s), it summarizes everything that you just wrote about and it is somewhat like your Introduction Sentence. Usually, your concluding sentence will say something like "In conclusion," or "Therefore," or "To summarize." Basically, when writing a formal paper, you have three steps -- "Tell them what you're going to tell them" (the Introduction), "Tell them" (the Body), and "Tell them what you just told them" (the Conclusion).