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I read in an American Accent book that there is no break between sibilants adjoining each other between words. For example, this phrase:
I was starting to worry.
The words was + starting sound like [wəzstɑrt̬ɪŋ] with no break. Am I right? I marked the sibilant sounds with bold.
I used the schwa sound in was because it's a function word and we usually give stress to content words and reduce the function words. I also used the tapped T in the word started.