This actually doesn’t happen for everyone. If we practice reading we get used to the pattern of the writing and sentence structure. Our brains are usually very good at picking up and repeating patterns.
It doesn’t always work, even for people with a lot of practice, think about when you have been reading aloud and the last few words of a sentence are on a different page; I’ve had to reread those lines to fix my prosody.
Edited punctuation.
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