The document discusses various phonetic modifications that occur to words when they are spoken in connected speech compared to in isolation. These include assimilation, elision, vowel reduction, strong and weak forms, liaison, contractions, and juncture. Assimilation involves sounds taking on the features of neighboring sounds. Elision is the loss of sounds, especially vowels. Vowel reduction refers to unstressed vowels becoming more central. Strong and weak forms distinguish between stressed and unstressed pronunciations of function words. Liaison is the smooth joining of words. Juncture refers to phonetic cues that mark word boundaries in connected speech.