[quote=ImportantNobody]
But we don't know for sure yet. We must enact a proper test.Quick! Use "desu" in proper grammar rules!
[/quote]

SOrry I was at work and uh......okie I guess
Desu is kind of like the English word "is", but it's hard to explain without bringing up the existance of the words iru/imasu or aru/arimasu. On it's own, iru/imasu is like defining something that is alive. While Aru/arimasu define of something that is not alive. But in the Japanese language you should not learn the meaning of Japanese words by trying to put Englishs word to them. Instead learn them by putting it in situations. For Example:
The Sky is Blue. Correct use of desu
The pizza is here. Correct use of arimasu
We are here. Correct use of imasu

Or if that didnt help I could just write in japanese from now on if that would be better O_O.
Watashi wa mohaya nihonjindesu kinishinai. Watashi wa tada no nekodesu. Watashi wa tonikaku, nihongo de kaku no ga kantan sono takusan, watashi wa jissai ni sore o konomu. Watashi mo nihongo de rorupurei suru koto ga deki, koko de kanodesu thats no nanika areba. Subete no watashi no nihonjin wa ya no tewoageru!!!!! Kore wa shojikina tokoro, watashi ga kitai shite ita kangei no taipude wa arimasendeshita O_O

Or will me writing in kanji be better? I could always switch keyboards xD