A nurse is reinforcing teaching with a client who is receiving morphine via a patient-controlled analgesia (PCA) infusion device. Which of the following statements by the client indicates an understanding of the teaching?

"I should always use the device even when it's not necessary."

"I will ask my family to push the dose button when I am asleep.

"I should tell the nurse if I am still having pain."

"I be careful about pushing the button so I don't get an overdose."