Questions & Answers about Tôi hoàn trả bản in.
Tôi is a neutral, polite first-person pronoun. It is very common in textbooks because it works in many situations and does not depend heavily on age or family relationship.
However, in real-life Vietnamese, speakers often choose pronouns based on who they are talking to, such as em, anh, chị, con, cháu, and so on. So tôi is correct, but in casual everyday conversation it can sound a bit formal or neutral rather than warm and natural.
For a learner, tôi is a safe choice.
Yes, sometimes. Vietnamese often drops the subject when it is obvious from context.
So if everyone already knows that I am the one doing the action, a speaker might simply say Hoàn trả bản in in a note, instruction, or very context-heavy situation.
But as a complete standalone sentence, keeping tôi is clearer and more natural for learners.