完了をする

You will mostly encounter this in formal writing or digital interfaces. In everyday speech, people usually drop the を and just say 完了する. However, adding the を makes the action of completing something feel more deliberate. It turns 'completion' into a specific task you are performing. For example, in a manual, you might see 登録の完了をする (Perform the completion of registration). Grammatically, it functions as a noun (完了) followed by a verb (する). It is like wearing a suit to a meeting instead of a hoodie—both get the job done, but the suit says you mean business. If you are coding a website or writing a professional report, this is your go-to structure. Just remember that it is a bit stiff, so don't use it while playing tag with your five-year-old nephew. Unless, of course, the tag game has a formal contract.

Imagine you are using a banking app in Tokyo. After you transfer money, the screen flashes: 振込が完了しました (Transfer complete). Or perhaps you are at a government office (a fun Saturday, right?). The clerk might say, 手続きの完了をしておきます (I will handle the completion of the procedures). On social media, you might see a gamer post a screenshot of a 100% completion screen with the caption 全クエストの完了をした！ (I have completed all quests!). It also shows up in project management tools like Slack or Jira when a ticket is finally moved to the 'Done' column. It is the sound of a digital stamp hitting paper. Even in the world of Netflix subtitles, you might see it when a character finishes a secret mission. It is universal for anything that requires a 'Finished' status.

Reach for this phrase when you want to sound professional, precise, or technical. Use it when you are talking about software installations, bank transfers, or official applications. It is perfect for Zoom meetings when your boss asks for a status update on a project. Using 完了をする shows that you have not just stopped working, but that you have reached the defined end-point of the task. It is also great for setting goals. 'I want to 完了をする my degree by next year' sounds much more committed than just saying you want to finish it. It is the language of winners, achievers, and people who actually read the terms and conditions. If there is a checkbox involved in your task, this is likely the phrase you want.

Do not use 完了をする for casual, physical acts that have no 'official' status. If you finish your coffee, don't say コーヒーの完了をした. Your friends will look at you like you are a malfunctioning robot. Similarly, don't use it for things that just 'end' naturally, like a movie or a rainy day. For those, use 終わる (owaru). 完了をする requires an active effort to bring something to a pre-defined conclusion. You wouldn't say you 'completed' a nap—you just woke up. Also, avoid it in very intimate settings. Saying 愛の完了をした (I have completed our love) sounds like you are breaking up via a legal filing. Stick to 終わる for the messy, human stuff and save 完了 for the spreadsheets.

The biggest trap is using it instead of 終わる. ✗ 宿題を完了をした (I completed my homework) is grammatically okay but sounds like you are submitting your math problems to the United Nations. ✓ 宿題が終わった is what a normal human says. Another mistake is forgetting the を when you want to be extra formal, or including it when you are trying to be quick. ✗ 完了しました is perfect for an app, but if you are writing a formal manual, 完了をしました adds that extra layer of professional polish. Some learners also confuse it with 終了 (shuryo). While similar, 終了 often implies a time limit has run out (like a game ending), whereas 完了 implies a goal has been reached. Don't let your grammar 'timeout' by picking the wrong one!

You have a few options in the 'Finish Line' department. 終わる (owaru) is the king of casual finishing. It is the 'jeans and t-shirt' of verbs. 終了する (shuryo suru) is more about things coming to an end, often used for events, sessions, or time limits. Think of a concert 'ending' versus a project 'completing.' Then there is 完遂する (kansui suru), which is the 'hardcore' version. It means to carry something out to the very end against all odds. If you climb Mt. Everest, you 完遂 it. 完了をする sits comfortably in the middle—professional, systematic, and satisfyingly final. It is the 'Business Casual' of completion phrases. Use it when you want to be taken seriously without sounding like a samurai on a life-or-death mission.

In the wild, you will see 完了 in many forms. The most common is the simple verb form 完了する. You will also see 完了ボタン (Completion button) on almost every Japanese website. In business emails, you might see 完了報告 (Completion report), which is the bane of every office worker's existence. If something is already done, it is 完了済み (Already completed). You might see this on your Amazon order history. There is also 未完了 (Uncompleted), which is the annoying red text that tells you that you forgot to fill out your middle name on a form. Understanding these variations helps you navigate the Japanese digital landscape like a pro. It is like knowing the different flavors of KitKats—essential for survival.

Is 完了をする more formal than 完了する? Yes, adding the を treats 'completion' as a formal object, making it sound more deliberate. Can I use it for eating? No, unless you are a competitive eater and it is a timed challenge. Is it used in social media? Yes, mostly for gaming achievements or finishing big personal projects like a marathon. What is the difference between this and 終わる? 終わる is for general finishing; 完了 is for systematic completion. Do apps use this? Constantly! It is the standard term for 'Task Finished' in software. Is there a slang version? Not really, as it is a formal term, but gamers might just type 完了 or コンプ (comp, for 'complete').