You know the full stop, right? Little dot that tells the reader when to stop the sentence and take a breath. Problem is, in speech, the full stop is implied, and can often lead to misunderstandings. (“I thought you were finished speaking. Well you stopped talking. Well, I didn’t know you were just drawing breath, you stopped talking. Who are you, anyway, Robert Mitchum?” and so on). Nobody finishes a sentence by actualy saying the words ‘full stop’. That would be silly.
Thankfully, my wife is a genius, and has solved this problem by the simple act of getting herself an iPad.
Now I *know* when she’s finished a sentence, because they all finish with “on my iPad.”