The word "didst a favor" is spelled as /dɪdst ə ˈfeɪvər/. The spelling of this word can be explained through IPA phonetic transcription. "Didst" is pronounced as /dɪdst/ with a short "i" sound and a voiceless "d" sound. "A" is pronounced as /ə/ with a schwa sound, and "favor" is pronounced as /ˈfeɪvər/ with a long "a" sound and a voiced "v". Together, these sounds create the correct spelling and pronunciation of "didst a favor."