Stress Changes and Shifts In Sentences

There are times when the stress changes depending on how and where a word is used in a sentence, to make the pronunciation smoother and more rhythmic.

The end glottal catch of a word is dropped if it is followed by another word. As a result, sentences will sound more fluid as words flow naturally as you speak. On the contrary, if that word is at the end of the sentence or is followed by a comma, then its end glottal catch is retained..

Shifting of accents also happens when a suffix is added to the end of a word with an end glottal catch. If a suffix is added after the final vowel of the word, the accent is shifted to that suffix. ( We'll learn more about suffixes in later lessons ). Take a look at the examples below.
It's important to take note of the changing stress marks in a sentence. If you notice the dictionary shows a certain stress mark on a word, and later you see the stress mark has changed in an example sentence, it does not necessarily mean there is a typo or error in the educational materials, but rather that the stress has changed in the usage.