できます

The Japanese verb できます (dekimasu) is a cornerstone of Japanese communication, functioning as the polite form of the dictionary verb dekiru. While most English speakers first learn it as the equivalent of the English auxiliary verb 'can,' its semantic range is significantly broader, encompassing concepts of completion, emergence, and possibility. At its most fundamental level, dekimasu describes the transition of something from a state of non-existence or non-capability to a state of existence or capability. This nuance is vital for learners to grasp because it explains why the word is used both for personal skills and for physical objects being finished. When you say you 'can' do something in Japanese, you are essentially saying that the ability to do it has 'emerged' or 'materialized' within you. This differs from the English 'can,' which often focuses on internal power or external permission. In Japanese, dekimasu is an intransitive verb, which is why it typically takes the particle が (ga) rather than the object particle を (o). This grammatical quirk reflects the idea that the ability or the finished product is the subject that has come into being.

Ability and Skill

Used to describe physical or mental capabilities, such as speaking a language, playing an instrument, or performing a specific task. Example: Nihongo ga dekimasu (I can speak Japanese).

Completion and Readiness

Used when a task is finished or something has been prepared. This is common in household and restaurant settings. Example: Gohan ga dekimashita (Dinner is ready/finished).

Furthermore, dekimasu is used to describe the construction or establishment of physical structures or social systems. If a new convenience store is built in your neighborhood, you would use dekimasu to describe its appearance. This 'emergence' aspect also extends to abstract concepts like making friends (tomodachi ga dekimasu) or having a child (kodomo ga dekimasu). In these contexts, the word emphasizes the result or the new state of existence rather than the process of creation itself. Because it is so versatile, it is one of the most frequently used verbs in daily conversation, appearing in everything from business negotiations (discussing what is possible under a contract) to casual chats about hobbies. Understanding the breadth of dekimasu allows a learner to move beyond simple translations and start thinking in the logic of the Japanese language, where the focus is often on the state of things as they are or as they have become.

Possibility and Permission

In certain contexts, it indicates whether an action is possible given the circumstances, similar to 'it is possible to...' Example: Koko de kado ga dekimasu ka? (Is it possible to use a card here?).

Using できます (dekimasu) correctly requires understanding its two primary grammatical structures. The first is the [Noun] + が + dekimasu pattern. This is used for simple nouns that represent an action or a skill, such as languages, sports, or tasks. For example, 'I can do karate' becomes Karate ga dekimasu. It is crucial to remember that dekimasu is not a transitive verb in the same way 'do' is in English. You are not 'doing' the karate; rather, the 'karate' is something that is 'possible' or 'capable of being done' by you. This is why the subject marker ga is used. If you use the object marker o, it will sound grammatically incorrect to native speakers. This structure is very common for expressing hobbies and professional skills during introductions.

Noun + Ga + Dekimasu

The simplest way to express ability. The noun must be something that can be performed. Example: Ryori ga dekimasu (I can cook).

The second structure is used for verbs: [Verb Dictionary Form] + こと + が + dekimasu. Since dekimasu needs a noun to follow the particle ga, we must turn the verb into a noun phrase. This is achieved by adding koto (thing/fact) after the dictionary form of the verb. For instance, to say 'I can swim,' you take the verb oyogu (to swim), add koto to make it 'the act of swimming,' and then add ga dekimasu. This results in Oyogu koto ga dekimasu. This pattern is more formal and explicit than the potential form of verbs (like oyogemasu), and it is often preferred in written Japanese or when you want to be very clear about a specific capability.

Verb (Dict.) + Koto + Ga + Dekimasu

Used to express ability regarding a specific action. Example: Kanji o kaku koto ga dekimasu (I can write kanji).

Finally, dekimasu is used in the past tense dekimashita to indicate that something has been completed or has just appeared. If you are waiting for a friend and they finally arrive, or if you have finished a project, dekimashita is the perfect word. In a restaurant, the waiter might say Ryori ga dekimashita to indicate your food is ready. This usage highlights the 'resultative' nature of the verb—it focuses on the fact that the state of completion has been reached. It is also used to describe the formation of relationships, such as koibito ga dekimashita (I got a boyfriend/girlfriend), which literally means 'a lover has emerged/been made.'

Negative Form

The negative form is dekimasen. It means 'cannot do' or 'is not finished.' Example: Unten ga dekimasen (I cannot drive).

In Japan, you will encounter できます (dekimasu) in a wide variety of social and professional settings. One of the most common places is in the service industry. When you enter a shop or restaurant and ask if a certain service is available—such as paying with a credit card or making a substitution in a meal—the staff will often respond with dekimasu (it is possible) or dekikanemasu (a very formal 'cannot do'). For example, asking Kado wa dekimasu ka? (Can I use a card?) is a standard way to check payment options. In this context, the word isn't about the staff's personal skill, but rather the capability of the establishment's system. Similarly, in a restaurant, when the chef finishes a dish, they might call out Dekimashita! to signal to the servers that the food is ready for pick-up. This creates a sense of immediacy and completion that is central to the Japanese dining experience.

In the Workplace

Used to discuss project timelines and capabilities. A manager might ask, 'When will the report be finished?' (Hokokusho wa itsu dekimasu ka?). An employee might respond, 'It will be finished by tomorrow' (Ashita made ni dekimasu).

Another frequent setting is in schools and during self-introductions (jikoshokai). When meeting someone for the first time, it is common to list your skills using dekimasu. A student might say Eigo to Chugokugo ga dekimasu (I can speak English and Chinese). In a classroom, a teacher might ask Dekimashita ka? to check if the students have finished their exercise. Here, the word acts as a quick check for progress. You will also hear it in the news or when walking around a city, specifically regarding urban development. Signs saying Atarashii manshon ga dekimasu (A new apartment building will be built) are common sights. This highlights the 'emergence' aspect of the verb, indicating that a new physical entity is coming into the world. Even in personal life, when someone mentions they have a new child or a new partner, they use dekimasu, emphasizing the new presence in their life.

Social Contexts

Used to announce life changes. Example: Kodomo ga dekimashita (We're having a baby / A child was born).

Finally, dekimasu is used in polite requests and inquiries about possibility. When you are at a hotel and ask if you can leave your luggage, you might say Nimotsu o azukeru koto wa dekimasu ka?. The response Hai, dekimasu is a standard, polite affirmation. This versatility makes it a 'utility' verb that can get you through many situations where you might otherwise struggle to find the specific potential form of a verb. If you forget how to say 'can eat' (taberareru), you can always fall back on taberu koto ga dekimasu. It is a safe, polite, and universally understood way to express capability and possibility across all strata of Japanese society.

One of the most frequent errors made by English speakers when using できます (dekimasu) is the misuse of particles. In English, we say 'I can do it,' where 'it' is the direct object. Naturally, learners want to use the Japanese object particle を (o), leading to incorrect sentences like Nihongo o dekimasu. However, dekimasu is an intransitive verb that describes a state of potentiality or existence. Therefore, the thing that is possible must be marked with the subject particle が (ga). Using o is a major red flag that marks someone as a beginner. Another common mistake is using dekimasu to mean 'know' or 'understand.' While Nihongo ga dekimasu can be translated as 'I can speak/understand Japanese,' you cannot use it for specific facts. For example, you wouldn't say Kono kanji ga dekimasu to mean 'I know this kanji'; instead, you should use wakarimasu (understand) or shitteimasu (know).

Particle Error: 'O' vs 'Ga'

Mistake: Piano o dekimasu. Correct: Piano ga dekimasu. The ability is the subject of the state, not the object of an action.

Another nuanced mistake involves the difference between dekimasu and the potential form of verbs. While taberu koto ga dekimasu and taberareru both mean 'can eat,' they are used in different contexts. The koto ga dekimasu form is often used for situational possibility (e.g., 'Is it possible to eat here?') or formal declarations of ability. Using it in casual conversation where a simple potential form would suffice can make you sound overly robotic or textbook-like. Additionally, learners often forget that dekimasu also means 'to be finished.' If a waiter asks Dekimashita ka?, they are asking if you are finished with your meal, not if you 'could do' it. Misinterpreting this can lead to confusing exchanges. Finally, be careful with the phrase kodomo ga dekimasu. While it literally means 'a child is made/born,' saying it out of context can be surprising, as it is the standard way to announce a pregnancy or the birth of a child.

Over-reliance on 'Koto ga dekimasu'

While correct, using this long form for every 'can' statement sounds stiff. Try to learn the potential form (e.g., hanasemasu instead of hanasu koto ga dekimasu) for more natural speech.

To truly master できます (dekimasu), it is helpful to compare it with other words that express ability or completion. The most direct alternative is the Potential Form of verbs (e.g., yomemasu for 'can read'). The potential form is generally more concise and is used more frequently in casual and semi-formal spoken Japanese. While yomu koto ga dekimasu is grammatically perfect, yomemasu feels more natural in a conversation about what books you can read. Another word often confused with dekimasu is わかります (wakarimasu), which means 'to understand.' If someone asks if you speak Japanese, you can say either Nihongo ga dekimasu or Nihongo ga wakarimasu. However, dekimasu implies a higher level of active skill (speaking, writing), whereas wakarimasu might just mean you understand what is being said. For physical completion, 終わります (owarimasu) is a common alternative. While shukudai ga dekimashita means 'the homework is finished (and exists now),' shukudai ga owarimashita simply means 'the task of doing homework has ended.'

Dekimasu vs. Potential Form

Dekimasu: More formal, emphasizes situational possibility or a noun-based skill.
Potential Form: More natural in speech, integrated into the verb itself.

In terms of 'being good at' something, you might consider 上手です (jozu desu) or 得意です (tokui desu). While dekimasu just states the fact of ability, jozu is a compliment used for others' skills, and tokui is used to describe a skill you are confident in. For example, Ryori ga dekimasu is a humble statement of fact, while Ryori ga tokui desu suggests you are a good cook. For the meaning of 'emergence,' words like 生まれます (umaremasu - to be born) or 建ちます (tachimasu - to be built) are more specific. Dekimasu is the general, all-purpose term for these events. In business, you might hear 可能です (kano desu), which is the formal noun-adjective for 'possible.' It is used in technical documents or very formal meetings where dekimasu might feel too conversational. Understanding these distinctions helps you choose the word that best fits the social context and your specific intent.

Dekimasu vs. Tokui desu

Dekimasu: 'I can do it' (Fact).
Tokui desu: 'I am good at/confident in it' (Subjective strength).