Orestes (Electra, Euripides) asks whether it may not be an avenging
daemon (alastor) in the shape of a god, that bids him avenge his
father. Is Shakespeare borrowing from Euripides, or from a sermon,
or any contemporary work on ghosts, such as that of Lavater?

A girl dies or is sacrificed before her marriage, and characters in
Romeo and Juliet, and in Euripides, both say that Death is her
bridegroom. Anyone might say that, anywhere, as in the Greek
Anthology -


"For Death not for Love hast thou loosened thy zone."


One needs the space of a book wherein to consider such parallels.
But confessedly, though a parade is made of them, they do not prove
that Shakespeare constantly read Greek tragedies in Latin
translations.

To let the truth out, the resemblances are mainly found in such
commonplaces: as when both Aias and Antony address the Sun of their
latest day in life; or when John of Gaunt and Aias both pun on their
own names.

The situations, in Hamlet and the Choephorae and Electra, are so
close that resemblances in some passages must and do occur, and Mr.
Collins does not comment specially upon the closest resemblance of
all: the English case is here the murder of Duncan, the Greek is the
murder of Agamemnon.