"You should go to the doctor."
(second-person "you"; informal)

"Go to the doctor!"
(second-person "you"; formal)

"You all should do the homework(plural)."

"Do the homework(plural)!"
(second-person "you"; formal)

"The doctor says, you should stay in bed."
(second-person "you"; formal)

"The teacher has said, we should always speak in German."

"How should I help the woman?"