Beth has finished the essay.
=>The essay has been fisnished by Beth.
*Cấu trúc câu bị động thì hiện tại hoàn thành:
(+) O + has/ have + been + V3/ed + ___ (by sb).
(-) O + has/ have + not + been + V3/ed + ___ (by sb).
(?) Has/ Have + O + been + V3/ed + ___(by sb)?