From a first-grade reader:
"First Turtle goes to the flower shop."
One of these definitely needs a comma; one is optional but reduces confusion.
The definitely needed comma is this:
You need a comma before a word of address, as in "Hi, Bonnie" or "Thanks, Jake."
In the other sentence, an optional comma would avoid confusion:
"First, Turtle goes to the flower shop."
Without the comma, someone could read the subject to be "First Turtle," as opposed to "Second Turtle."
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