How do you write for the ear?
By writing in a way that works in one pass, at the speed of speech, with no ability to go back — which changes almost every decision from how you would write for a page.
What changes:
Sentences get shorter, because the listener has to hold the whole structure in working memory. A subordinate clause that reads elegantly is a burden when heard.
Subject and verb come early. Long introductory clauses leave a listener waiting to find out what the sentence is even about.
One idea per sentence, and one sentence per breath.
Repetition becomes a virtue rather than a fault. In print, repeating a name is clumsy; in speech, it is orientation. A listener who loses the thread cannot scroll back, so restating who and what is a service, not clutter.
Signposting matters — telling people what is coming, marking transitions, and summarising before moving on. Redundancy is built into all spoken forms for exactly this reason.
Numbers get rounded and made concrete. "Nearly a third" beats "31.7%", and comparisons beat raw figures.
Punctuation becomes rhythm, marking pauses rather than grammatical structure.
Avoid what cannot be heard: parentheses, footnotes, complex lists, homophones that will be misheard, acronyms not yet expanded, and anything that depends on spelling.
The test that catches everything. Read it aloud, standing up. Every place you stumble, run out of breath, or have to reread is a place the listener will lose you. This single practice fixes more than any rule.
Openings and endings carry disproportionate weight, since attention is highest at the start and last impressions persist — which is why speeches and podcast segments are structured around them.
For scripts specifically: write the way you actually speak, including contractions; mark where emphasis falls; and leave silence, which is a tool rather than dead air.
The broader point: anything written to be spoken, heard, or read aloud to someone — instructions, announcements, children's books, audio descriptions — benefits from the same discipline.