Repeat and duplicate are often used interchangeably, but there are subtle differences between them. "Repeat" means to do or say something again, often in the same way. "Duplicate" means to make an exact copy of something. Think of it this way: you repeat an action, but you duplicate an object.
Here are some example sentences to illustrate the difference:
Repeat:
Duplicate:
Notice that "repeat" focuses on the action of doing something again, while "duplicate" focuses on creating an identical copy. You can repeat a mistake, but you duplicate a document. You can repeat a question, but you duplicate a photograph.
Sometimes the words can be used in similar contexts, but their nuance is different. For example, you could say, "Repeat after me," or "Duplicate this form." But you would never say "Duplicate after me." You can see the difference in the emphasis.
Happy learning!