jaa arimasen vs. arimasen.
When should you use jaa arimasen and when arimasen. Why do you use two different forms in these two sentences.

If you say "I am not japanese":
1) nihonjin jaa arimasen
And when you say "it is not late"
2) osoku arimasen

Question

jaa arimasen vs. arimasen.
When should you use jaa arimasen and when arimasen. Why do you use two different forms in these two sentences.

If you say "I am not japanese":
1) nihonjin jaa arimasen
And when you say "it is not late"
2) osoku arimasen

Answer

The affirmative sentences are;
1) watashi wa  nihonjin desu.  (formal version)  
    watashi wa nihonjin da.  (informal version) 
2) osoi desu 
    osoi

As ローラchan said,1) nihonjin(noun) + desu, da,  2) adjective, 
so you have to use the conjugation of 1)desu and of 2)adjective.

The negative sentences are going to be;
1) wtashi wa nihonjin dewa arimasen. 
    watashi wa nihonjin dewa nai. (jaanai, janai).
2) osokunai desu
    osokunai

Answer

1) "jaa(/dewa) arimasen" ---because "japanese" is noun        
2) "arimasen"---because "late" is adjective

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