The correct spelling of the phrase "putting the shelf" is /ˈpʊtɪŋ ðə ʃɛlf/. The first word, "putting," is spelled with a double T because it is a present participle form of the verb "put." The second word, "the," is spelled with a silent E on the end, as pronouncing it would turn the vowel sound into a long sound instead of a short one. Finally, "shelf" is spelled with "sh" instead of "s" because it is a voiceless postalveolar fricative sound.