(he/she/it) is (3rd-person singular present of "sein")
verb
3.
du
you (informal; addressing one person)
personal pronoun
4.
ich
I (not capitalized unless it is in the beginning of a sentence); ego (capitalized - Ich)
personal pronoun; noun
5.
nicht
not
adverb
6.
die
the (definitive article; nominative/accusative, singular feminine or plural form of der); that, which, who (relative pronoun); this one, that one, these ones, those ones (demonstrative pronoun)