The spelling of the phrase "up on which" can be confusing for some people. The first word, "up," is easy to spell, but the second word, "on," can sometimes be written as "an" or "en." The third word, "which," is often spelled correctly, but sometimes people add an unnecessary "t" at the end. To help with proper spelling, it is useful to understand the IPA phonetic transcription of each word. "Up" is pronounced as /ʌp/, "on" as /ɒn/, and "which" as /wɪtʃ/.