返事する

The Japanese verb 返事する (henji suru) is a foundational action in Japanese communication, literally translating to "to do a reply" or "to give an answer." While it is often translated simply as "to reply," its usage is deeply rooted in social etiquette and the immediate acknowledgement of another person's presence or inquiry. In Japanese culture, failing to give a henji is not just a lapse in communication; it is often perceived as a sign of disrespect or a lack of social awareness. This verb is a "suru-verb," meaning it is formed by taking the noun 返事 (henji - reply/answer) and adding the verb する (suru - to do). This structure is incredibly common in Japanese for turning concepts into actions. When you hear your name called in a classroom, the act of saying "Hai!" (Yes!) is the most basic form of henji suru. It covers a spectrum from a simple vocal acknowledgement to a formal written response to an invitation or a business proposal.

Core Concept

The act of acknowledging a call, a question, or a message. It is the verbal or written bridge that confirms a message has been received and understood.

Social Context

In schools and workplaces, a clear and prompt henji is vital. It demonstrates that you are paying attention and are ready to engage.

One must distinguish 返事する from 答える (kotaeru). While both can mean "to answer," kotaeru is typically used for providing a solution to a problem or a specific answer to a question (like a math problem or a quiz). In contrast, henji suru is about the social act of responding to a person. If someone asks "Are you coming to the party?" and you say "Yes," you are doing both, but the act of making that social acknowledgement is henji suru. If you are silent when someone speaks to you, you are failing to henji suru. This word is ubiquitous in daily life, appearing in text messages (LINE), emails, and face-to-face interactions. It carries the weight of "returning" (返) the "matter/thing" (事) back to the sender.

Furthermore, henji suru is used across all levels of formality. In a casual setting, you might tell a friend, "Henji shite yo!" (Give me a reply!), while in a business email, you would use more formal variations like "O-henji itadakereba saiwai desu" (I would be grateful if you could reply). The noun form, henji, is often prefixed with the honorific 'o' (お返事) when referring to a reply from someone of higher status or when being polite. Understanding this word is key to mastering the flow of Japanese conversation, as it dictates the rhythm of interaction. Whether it is a nod, a short "un," or a long letter, any form of acknowledgment falls under this umbrella. It is the oil that keeps the gears of Japanese social harmony turning smoothly.

Kanji Breakdown

返 (Hen) means to return or send back. 事 (Ji) means a thing, matter, or incident. Together, they mean returning a matter—hence, a reply.

In summary, henji suru is more than a linguistic tool; it is a social obligation. It encompasses the physical act of speaking or writing back, the psychological act of acknowledging another's existence, and the cultural act of maintaining harmony. From the moment children enter preschool, they are taught the importance of a clear henji. As an adult, your professionalism and reliability are often judged by how consistently and promptly you henji suru. It is a word that connects people, closes loops of communication, and ensures that everyone in a group is on the same page.

Using 返事する (henji suru) correctly requires an understanding of Japanese particles and verb conjugation. As a suru-verb, it follows the standard pattern for irregular verbs in Japanese. You can use it as a standalone verb (返事する) or as a noun followed by the particle 'o' (返事をする). The latter is slightly more formal or emphasizes the 'reply' as a specific object. The most common particle associated with this verb is に (ni), which indicates the person or the medium (like an email or letter) that you are responding to. For example, "Tom-san ni henji suru" means "to reply to Tom." If you are replying to a message, you would say "Meeru ni henji suru." Understanding this directional particle is crucial for natural-sounding Japanese.

Common Grammatical Patterns

[Person] に 返事する: Reply to [Person]
[Medium] に 返事する: Reply to [Medium (email/letter)]
すぐに 返事する: Reply immediately

Conjugation is also vital. In polite speech (desu/masu), it becomes 返事します (henji shimasu). In the past tense, it is 返事しました (henji shimashita). If you want to ask someone to reply, you use the 'te' form: 返事してください (henji shite kudasai). Because the act of replying often involves a third party, honorifics frequently come into play. When you are waiting for a reply from a superior, you might say "O-henji o omachi shite orimasu" (I am waiting for your reply), where 'o' is added to 'henji' for politeness. Conversely, when you are replying to a superior, you might use the humble form "O-henji itashimasu."

Another interesting aspect of henji suru is its use in negative contexts. The phrase "Henji ga nai" (There is no reply) is very common when someone is ignoring a message or if someone is unconscious. In a more active sense, "Henji o shinai" (To not reply) implies a choice. For instance, "Aete henji o shinai" means "To intentionally not reply," perhaps to show anger or lack of interest. In the digital age, this is often associated with "kidokuスルー" (kidoku suru - reading a message but ignoring it/leaving it on read), though henji shinai remains the standard way to describe the lack of response.

Politeness Levels

Casual: 返事する (henji suru)
Polite: 返事します (henji shimasu)
Honorific (to superior): お返事なさる (o-henji nasaru)
Humble (to superior): お返事いたす (o-henji itasu)

Finally, consider the adverbial modifiers. Words like sugu ni (immediately), yatto (finally), and teinei ni (politely/carefully) are often paired with henji suru to add nuance. "Yatto henji ga kita" (A reply finally came) expresses relief after a long wait. "Teinei ni henji suru" suggests that the person took the time to write a thoughtful and respectful response. By combining these adverbs with the correct conjugation and particles, you can convey a wide range of emotions and situations involving the act of replying.

The word 返事する (henji suru) is woven into the fabric of daily Japanese life, from the most casual interactions to the stiffest corporate environments. One of the first places a learner will encounter it is in a classroom setting. Teachers often say, "Henji wa?" (Where is your reply?) if a student remains silent after being called upon. In this context, it isn't just about the answer to a question; it's about the acknowledgment of the teacher's call. A crisp "Hai!" is the expected henji. This cultural emphasis on vocal acknowledgment starts in preschool and continues throughout a person's life. In many Japanese companies, new employees are specifically trained to give a loud and clear henji to show energy and willingness to work.

Daily Life

Parents telling children: "Chanto henji shinasai!" (Give a proper reply!) when the child is being stubborn or quiet.

Digital Communication

On LINE or Slack: "Henji okurete gomen!" (Sorry for the late reply!) is perhaps the most common phrase used among friends and colleagues.

In the realm of romance and social gatherings, henji suru takes on a more anxious tone. People often discuss "henji o matsu" (waiting for a reply) after confessing their feelings or inviting someone on a date. In anime and drama, you'll frequently see characters staring at their phones, wondering why the other person hasn't henji shita yet. The phrase "yoi henji o matsu" (waiting for a good reply/favorable answer) is a standard way to end a request or a proposal, indicating hope for a positive outcome. It's a versatile word that captures the tension and relief inherent in human connection.

Business settings are where the word becomes more formalized. You won't just hear henji suru; you'll see it in every email thread. Phrases like "Go-henji arigatou gozaimasu" (Thank you for your reply) are essential for maintaining professional relationships. If a deadline for a response is approaching, a colleague might ask, "Ano ken, mou henji shimashita ka?" (About that matter, have you replied yet?). Here, henji represents a commitment or a decision. Whether it's a simple "yes" to a coffee invite or a complex multi-page response to a legal inquiry, henji suru is the action that moves the process forward.

Finally, you'll hear it in emergencies or serious situations. If someone collapses, a bystander or paramedic might shout, "Henji shite!" (Respond! / Answer me!). In this life-or-death context, henji is the sign of consciousness. It's the most basic proof of life and awareness. This range—from a polite email to a desperate plea for a sign of life—shows just how fundamental henji suru is to the Japanese experience of communication. It is the definitive word for the act of reaching back across the gap between two people.

For English speakers, the most frequent mistake when using 返事する (henji suru) is confusing it with 答える (kotaeru). In English, "answer" can be used for almost anything: answering a phone, answering a question, or answering a door. However, in Japanese, these are distinct. Kotaeru is used when there is a "correct" answer or a specific piece of information being sought. For example, you kotaeru a math problem (mondai ni kotaeru). You henji suru when you are acknowledging a person's call or message. If you use kotaeru when you should use henji suru, it can sound like you are answering a test question rather than engaging in a social interaction.

Henji suru vs. Kotaeru

Use 返事する for social responses (emails, calls, invitations).
Use 答える for information/solutions (tests, specific questions, problems).

Another common error involves particle usage. Learners often try to use the direct object particle o with the person they are replying to, like "Tom-san o henji suru." This is incorrect. You must use ni to indicate the person. The particle o is reserved for the reply itself (e.g., "Henji o suru"). Think of ni as "to"—you are giving a reply to someone. Furthermore, forgetting to add 'o' for politeness (o-henji) when talking about a superior's reply is a subtle but important social mistake. While "henji" isn't rude, "o-henji" shows that you value the other person's time and response.

A third mistake is the nuance of "ignoring." In English, we might say "He didn't answer me." In Japanese, if you say "Kare wa henji shinakatta," it sounds like he physically didn't speak back. If you mean he ignored your text message specifically, Japanese people often use the slang "mushi suru" (to ignore) or "suroo suru" (to through/ignore). Using henji suru in its negative form is grammatically correct but might not capture the emotional nuance of being "ghosted" or ignored in a digital context. Finally, be careful with the timing. In Japan, saying "ato de henji suru" (I'll reply later) and then forgetting is a significant social faux pas. It's often better to give a short henji now than a long one too late.

Lastly, learners sometimes over-rely on henji suru when more specific verbs are appropriate. For example, if you are replying to a formal invitation, kaitou suru (to respond/answer) or henshin suru (to reply to a message) might be more precise. Henji suru is the broad, safe choice, but as you reach higher levels (B1/B2), you should start using these more specific terms. Using the broad term in a very formal business proposal might make your Japanese sound a bit "childish" or overly simplified. Always consider the medium and the formality of the situation.

While 返事する (henji suru) is the most versatile term for replying, Japanese has several synonyms that are used in more specific contexts. Understanding these will help you sound more natural and precise. The most common alternative is 返信する (henshin suru). This is specifically used for replying to electronic communication like emails, text messages, or letters. While you can say "meeru ni henji suru," saying "meeru ni henshin suru" is much more common and sounds more professional. Henshin literally means "return message.".

返事する (Henji suru)

General purpose. Used for vocal responses, simple acknowledgments, and general replies.

返信する (Henshin suru)

Specific to messages. Used for emails, LINE, letters, and SNS replies.

回答する (Kaitou suru)

Formal/Academic. Used for answering surveys, official inquiries, or providing a solution.

Another important word is 応答する (outou suru). This is often used in technical or formal contexts, like a computer responding to a ping or a person responding to a radio call. It has a nuance of "reacting" to a signal. In medical contexts, "outou ga nai" means the patient is unresponsive. Then there is 答える (kotaeru), which we've discussed as being for specific answers to questions. If you are in a debate or a formal interview, you might use 回答 (kaitou) to provide a more definitive, data-backed answer.

For very formal situations, such as business or legal matters, you might encounter 返答する (hentou suru). This is a stiffer version of henji suru and is used when a formal statement or decision is being returned. It sounds more weighty and serious. On the other end of the spectrum, in casual conversation, people might just use 反応する (hannou suru), which means "to react." If you say something and someone doesn't react at all, you'd say "Hannou ga nai." While not a direct synonym for "reply," it's often used to describe the lack of a response.

Comparing these words helps illuminate the specific social function of henji suru. It is the most human and social of the group. It’s about the connection between two people. When you henji suru, you are saying, "I hear you, and I am here." The other words focus more on the medium (henshin), the content (kotaeru/kaitou), or the technicality (outou). Choosing the right word demonstrates your sensitivity to the context and your level of Japanese proficiency.