“For what, alas, can these my single arms?”
— Shak.
“Mæcænas and Agrippa, who can most with Cæsar.”
— Beau. & Fl.
3.
To be able; -- followed by an infinitive without to; as, I can go, but do not wish to.
“Yet he could not but acknowledge to himself that there was something calculated to impress awe, . . . in the sudden appearances and vanishings . . . of the masque”
— De Quincey.
“Tom felt that this was a rebuff for him, and could not but understand it as a left-handed hit at his employer.”
— Dickens.