Stem تُنذِرَ has 3 unique word forms and appears 8 times in the Quran.

Word Translation Occurrences
لِتُنذِرَ so that you warn, that you may warn, that you warn 8
وَتُنذِرَ and warn 4
لِّتُنذِرَ that you may warn 2
وَلِتُنذِرَ so that you may warn 2