The spelling of the word "observersing" is incorrect. The correct spelling of the verb form of observer is observing. It is pronounced as /əbˈzəːvərɪŋ/. The IPA phonetic transcription explains that the main stress is on the second syllable, followed by the schwa sound in the third syllable. The final -ing is pronounced as a nasal /ŋ/ sound. It is vital to use the correct spelling of words to ensure effective communication and to avoid misunderstandings.