call on

to visit

• I called on her.
• I called on Judy.
• I often call on him.
• When I called on him, he was not at home.
• You had better make sure that he is at home before you call on him.
• You had better make sure that he is at home, before you call on him.
• He wasn't at home when I called on him.
• He called on me at my office yesterday.
• I'll call on you at your office tomorrow.
• A friend of mine called on me at my office.
• We must avoid calling on others without an appointment.
• It is against etiquette to call on a person early in the morning.
• When I called on him, he was talking on the phone.
• May I call on you at your house tomorrow morning?
• I'll call on him tomorrow.
• He called on me yesterday.

to ask someone to do something

• We called on his aid.
• The President called on everyone to save energy.
• The president called on the people to unite in fighting poverty and disease.
• The committee called on all nations to work side-by-side to curb air pollution.
• And I call on the chairman of the Education Committee to support the motion.
• The court called on the lawyer to give evidence.
• They called on him to provide evidence.
• They called on us to do something to help the victims.
• We called on him for a speech.
• He called on state troops to end the strike.
• We will have to call on our friends to help us.