Sentence classification

I got an assignment from J where I should dig into the world of textual sentences from a stylometric view and try to fill in the blank in the statement: a sentence is _.

So a sentence is:

1. short
2. long
3. simple
4. complex
5. correct, grammatically well formed
6. common
7. factual
8. jounalistic
9. legal
10. scientific
11. temporal: past, now, future
12. narrative: first/second/third person, genus
13. non alpha: numerical, symbols
14. part of a language: english, german, spanish
15. in matrix form
16. compound
17. made up of difficult words
18. declarative
19. imperative
20. interrogative
21. exclamatory
22. conditional
23. regular
24. irregular