できる

The Japanese verb できる (dekiru) is one of the most versatile and essential words in the Japanese language. While most beginners first encounter it as the equivalent of the English word "can" or "to be able to," its utility extends far beyond mere ability. At its core, dekiru describes the transition of something from a state of non-existence or non-completion to a state of being or readiness. It is an intransitive verb, which fundamentally changes how sentences are structured compared to its English counterparts. When you say you "can" do something in English, you are the actor performing an action on an object. In Japanese, using dekiru, you are often stating that the possibility or the result exists in relation to you.

Core Ability

The most common usage is expressing a skill or a capacity. For example, speaking a language, playing an instrument, or performing a physical feat. Unlike the potential form of specific verbs, dekiru is often used with nouns that imply action, such as 'cooking' (ryouri) or 'skiing' (sukii).

Completion and Readiness

Another vital nuance is the sense of something being 'finished' or 'ready.' If a meal is cooked, a building is constructed, or homework is finished, Japanese speakers use dekiru. It implies the process is over and the result is now present.

Beyond these, dekiru is used to describe the formation of relationships or physical conditions. If you 'make a friend' or 'get a pimple,' you use dekiru because these things have 'appeared' or 'come into existence.' This sense of emergence is key to understanding why the word is used for everything from 'making a boyfriend' (kareshi ga dekiru) to 'a new store opening' (atarashii mise ga dekiru). It captures the moment a new reality is established.

Social Competence

In a more abstract sense, describing someone as 'dekiru hito' means they are capable, talented, or reliable. It is a high compliment in a professional setting, suggesting the person consistently produces results and handles tasks with ease.

Finally, consider the environmental or situational 'can.' If you say 'I can go tomorrow,' you aren't talking about a skill you learned, but rather the fact that your schedule allows for it. Dekiru covers this 'possibility' aspect perfectly. Whether it is the physical ability to lift a weight, the mental skill to solve a puzzle, the situational freedom to attend a party, or the physical completion of a task, dekiru is the linguistic tool that bridges the gap between 'not yet' and 'done.'

In summary, dekiru is the verb of manifestation. It tracks the progress of things coming into the world, whether those things are abilities in your brain, buildings in your neighborhood, or food on your plate. Understanding this 'emergence' aspect will help you use it much more naturally than simply thinking of it as a translation for 'can.'

Mastering できる (dekiru) requires a shift in how you think about sentence structure. The most important rule to remember is that dekiru is an intransitive verb. In English, we say "I can play the piano," where "piano" is the direct object. In Japanese, the structure is more like "As for me, the piano is possible." This is why we use the particle が (ga) to mark the thing you can do.

The [Noun] + ga dekiru Pattern

This is the simplest way to express ability. Use it with nouns that imply an action or a skill. Common examples include languages (Nihongo, Eigo), sports (tenisu, sakkaa), or hobbies (ryouri, piano).

The [Verb Dictionary Form] + koto ga dekiru Pattern

When you want to express the ability to perform a specific action described by a verb, you must nominalize that verb using 'koto' (thing/fact). This is more formal and specific than the potential form of a verb. For example, 'taberu koto ga dekiru' (can eat).

When using dekiru to mean 'to be completed' or 'to be made,' the subject is the thing that is being finished. If you are waiting for a house to be built, you would say 'ie ga dekiru.' If you are waiting for your passport to be issued, it's 'pasupooto ga dekiru.' In these cases, the focus is entirely on the result.

Past Tense: Dekita

The past tense dekita is extremely common. It can mean 'I could do it,' 'I finished it,' or 'It's done!' When a student finishes a test, they might shout 'Dekita!' to signal they are finished. If someone asks if you finished your homework, 'Dekimashita' is the natural response.

Negative forms are also crucial. Dekinai means 'cannot' or 'is not ready.' If you are struggling with a task, you might say 'zenzen dekinai' (I can't do it at all). If a store is not yet finished, you'd say 'mada dekite inai.' Note the use of the -te iru form to describe the ongoing state of incompletion.

Finally, dekiru can be used in a humble or polite way. When someone compliments your skills, a common modest response is 'mada mada dekimasen' (I still have a long way to go / I can't do it well yet). This demonstrates the social function of the verb in maintaining Japanese etiquette of humility.

You will hear できる (dekiru) everywhere in Japan, from the most formal business meetings to the most casual conversations among children. Its frequency is due to its broad semantic range. In daily life, the most immediate place you'll encounter it is in service environments. Restaurants, tailors, and repair shops all use dekiru to communicate that a service is complete or a product is ready for pickup.

In the Kitchen and Restaurants

When a chef finishes a dish, they might call out 'Dekita yo!' to the servers. When you order a suit, the clerk might tell you, 'Raishuu no kayoubi ni dekimasu' (It will be ready next Tuesday). Here, it replaces 'finish,' 'complete,' or 'be ready.'

In Schools and Education

Teachers use dekiru to evaluate students. A 'dekiru ko' is a 'capable child' or a 'smart kid.' If a student understands a math problem, they say 'Dekita!' to mean 'I solved it!' or 'I got it!' It is the primary word for academic achievement and understanding.

In the workplace, dekiru is used for project management. 'Kore, itsu dekimasu ka?' (When will this be done?) is a standard question from a manager. The response might be 'Ashita made ni wa dekimasu' (It will be done by tomorrow). It's also used to describe professional competence. A 'dekiru sarariiman' (capable salaryman) is someone who is efficient and gets things done.

Social and Romantic Life

Among friends, dekiru is the go-to word for new developments in life. 'Tomodachi ga dekita' (I made friends), 'Akachan ga dekita' (We're having a baby/The baby was conceived), or 'Kareshi ga dekita' (I got a boyfriend). It suggests these things 'happened' or 'came into being' naturally.

Finally, you'll hear it in public announcements. 'Atarashii koopoo ga dekimasu' (A new co-op is being built/opening). It signals the changing landscape of the city. Whether it's the birth of a child, the completion of a skyscraper, or the ability to speak a new language, dekiru is the word that marks the arrival of something new or the success of an effort.

Even though できる (dekiru) is a basic word, its unique grammar and broad range of meanings lead to several common pitfalls for English speakers. The most frequent mistake is related to particle usage. Because English uses the active voice ("I can do it"), learners instinctively want to use the object particle wo (を).

Mistake 1: Using 'wo' instead of 'ga'

Incorrect: Nihongo wo dekimasu. Correct: Nihongo ga dekimasu. Remember, dekiru is an intransitive verb. You aren't 'doing' the language; rather, the language ability 'exists' within you.

Mistake 2: Confusing 'Dekiru' with Potential Form

Learners often use 'koto ga dekiru' for every verb (e.g., 'yomu koto ga dekiru'). While grammatically correct, it sounds very stiff and textbook-like. In natural conversation, Japanese speakers prefer the potential form of the verb (e.g., 'yomeru'). Use dekiru primarily with nouns or when emphasizing external possibility.

Another mistake is misunderstanding the 'completion' sense. Some learners use owaru (to end) when they should use dekiru. If you say 'shukudai ga owatta,' it means the act of doing homework has ended. If you say 'shukudai ga dekita,' it means the homework is now a finished product. The latter is often more appropriate when showing your work to a teacher.

Mistake 3: Overusing 'Dekiru' for 'Can'

In English, 'can' is used for permission ("Can I go?"). In Japanese, using dekiru for permission is often incorrect or sounds like you're asking about your physical ability to walk. Use '~te mo ii desu ka' for permission instead.

Lastly, be careful with the phrase 'yoku dekimashita.' While it means 'well done,' it is mostly used by superiors to subordinates (like a teacher to a student). Using it to a boss or an elder would be condescending. Use more formal expressions of gratitude or praise instead.

Japanese has several ways to express ability, completion, and occurrence. Choosing the right one depends on the nuance you want to convey. できる (dekiru) is the generalist, but more specific verbs exist for different situations.

Potential Form (Verb-eru/rareru)

This is the most direct alternative for 'can.' While dekiru is a separate verb, the potential form is a conjugation. Use the potential form for specific actions: yomeru (can read), taberareru (can eat). It sounds more natural in daily conversation than 'verb + koto ga dekiru.'

Kanou (可能)

This is a formal noun meaning 'possibility.' It is used in technical, academic, or business contexts. For example, 'shiyou kanou' (available for use/can use). It lacks the 'skill' nuance of dekiru and focuses purely on logical or physical possibility.

Owaru (終わる) vs Kanryou suru (完了する)

When talking about completion, owaru means 'to end' or 'to finish the activity.' Kanryou suru is more formal, often used for system processes or official tasks. Dekiru is unique because it emphasizes the existence of the finished product.

For the sense of 'occurrence' or 'making,' you might consider tsukuru (to make). However, tsukuru is active (you make it), while dekiru is the result (it is made). Similarly, okoru (to occur) is used for events like accidents or earthquakes, whereas dekiru is used for things that are 'formed' like friendships or scars.

Konasu (こなす)

This verb means to handle or master a task efficiently. While dekiru just means you can do it, konasu implies you can do it well and with volume. It's a great word for describing someone who handles a heavy workload easily.

In summary, use dekiru as your default for ability and 'readiness.' Shift to the potential form for specific actions, kanou for formal possibility, owaru for the end of a process, and tsukuru when you want to emphasize the person doing the making.