That skull had a tongue in it, and could sing once.
Act V, Scene 1 · Hamlet
Context
Hamlet picks up a skull thrown from the grave and reflects that it once belonged to a living person who could speak and sing.
Analysis
The verb tense sequence—'had,' 'could,' 'once'—performs a small temporal collapse, moving from past possession to past ability to the finality of 'once.' The detail 'could sing' echoes the gravedigger's own singing moments before, creating an uncomfortable parallel: the skull once made the same sounds the gravedigger makes now. Hamlet's tone is more observation than mourning at this point; he's cataloging the transformation from speaking subject to mute object.
Essay Tip
Use this to argue that Hamlet's initial response to the skulls is almost detached, treating them as specimens rather than people—only when he learns one skull is Yorick's does his meditation become personal, showing that abstract mortality is easier to contemplate than specific loss.