call on sb to do sth
phr. v..phr. v.. to ask someone or an organization to do something, usually in a formal or public way.
phr. v.. to formally request or appeal to a person or entity to perform a specific action; often used in political or institutional contexts.
The president called on the citizens to stay calm.
Human rights groups have called on the government to change the law immediately.
The United Nations has called on all parties to the conflict to observe a permanent ceasefire and allow humanitarian aid to pass.
usually used in formal news reports or official statements rather than casual conversation.
contrast with the literal 'call on someone' (to visit) or the classroom sense (to ask a student to answer); this version requires the infinitive 'to do' structure.
They called on the public for help them.They called on the public to help them.this specific meaning requires the 'to + infinitive' structure after the object.