That's not how the word desu is used. You end the sentence with desu as an act of politeness.
Eg: "thank you desu"
UR STUPID AN NO NOTHING OF THE JAPNS PPL LANGAGE WAT U R SAYING IS OFFENSIEV TO ME BECUZ U ARE SO DUM
rly i can spek in the way of the japans ppl and u think u can correct ppl but gess wat UR RONG HERE