Question

read the excerpt from act i of hamlet.
bernardo: tis now struck twelve, get thee to bed.
francisco.
what is the meaning of the underlined phrase?
this is twelve.
its twelve oclock
twelve things have fallen.
a man was hit twelve times

Explanation:

The underlined phrase "Tis now struck twelve" uses archaic English ("Tis" = "It is", "struck" refers to a clock chiming to mark the hour). The context of telling someone to go to bed further suggests it refers to the time.

Answer:

It's twelve o'clock