Answer:
The central idea of the book is, aspects of good citizens
Answer:
just message me iff you whant me to help you?
This is a sentence. You can tell because it has a subject (Imala) and a verb clause (will play). In addition, it has a direct object *what she is playing* (the solo) and a prepositional phrase for some added clarity (in the concert).
The book is awesome.
Indicative state something that is happening.
Answer:
I'm not sure I understand the question. If I'm right tho it would be a sentence fragment.