The words "return" and "come back" are often used interchangeably, but there are subtle differences between them. "Return" is more formal and often implies a sense of obligation or completion, like returning a library book or returning from a trip that was planned. "Come back," on the other hand, is more informal and emphasizes the action of returning to a place or person.

Here are some example sentences to illustrate the difference:

• Return:

  • "I will return the book to the library tomorrow." (Meaning: I have a responsibility to return the book).
  • "After his trip to Europe, he returned home feeling refreshed." (Meaning: His trip was planned and he is completing it by coming home).

• Come back:

  • "I'll come back later; I'm busy right now." (Meaning: I'll return, but it's not an obligation).
  • "Come back anytime you want!" (Meaning: I'd like you to return whenever you like)

Notice that "return" often implies a previous action or a sense of finality, while "come back" emphasizes the act of returning itself. "Come back" can also be used more casually to simply mean that something will reappear or recur. For example, "The pain will come back later." You would not generally say, "The pain will return later."

However, many times, the two words are interchangeable, and the choice comes down to style or preference.

Happy learning!