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When a title precedes a name, it becomes part of the name, and is capitalized: I spoke to Constable Fraser this morning. (You don't use the title and the person's first name. Not in American...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/17411 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/17411 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
When a title precedes a name, it becomes part of the name, and is capitalized: > I spoke to Constable Fraser this morning. (You don't use the title and the person's _first_ name. Not in American English, anyway.) When a title comes after a name or stands alone, it's descriptive. It's not a proper adjective or adjective phrase, and therefore is lowercase: > I spoke to the constable this morning. I spoke to Fraser, who is the constable. _In your examples:_ The first one is being used as a form of address. I would capitalize it. The name is implied. > “I would be most grateful for your assistance on the matter, Constable.” When referring to the same person in the next sentence more broadly, not as a direct adress, lowercase the title: > The constable nodded and sat down.