- desu form is used to show respect for speakers of other person's feelings. usually, desu placed at the end of the sentence which the predicate is a noun or an adjective. ago, the masu form is also a show of respect to those speakers who talk to and located at the end of the sentence.
れい :
わたし は やまもと です。my name is yamamoto
おとうと は ごはn を たべます。 brother eat rice

