Sentence examples for a duty from inspiring English sources

The phrase "a duty" is correct and commonly used in written English.
It refers to a moral or legal obligation to do something. Example: It is my duty as a parent to provide for my children. Other examples: - As a citizen, it is your duty to vote in elections. - The employees have a duty to report any safety hazards in the workplace. - The soldiers bravely fulfilled their duty to defend their country. - It is the doctor's duty to provide the best medical care for their patients. - It is everyone's duty to protect the environment for future generations.