**のだ** (`noda`), or its **contracted form んだ** (`nda`), is an auxiliary verb that is used for:

- Expressing a reason or an explanation
- For emphasis

{% grammar %}
{% point source="Verb,0/の or ん,1/だ,2" /%}

{% point source="Adjective［い］,0/の or ん,1/だ,2" /%}

{% point source="Adjective［な］,0/の or ん,1/だ,2" /%}

{% point source="Noun,0/の or ん,1/だ,2" /%}
{% /grammar %}

## のだ to express a reason or explanation

Let's see a simple example to understand the use of のだ.

A friend of yours asks you if you can would like to come for a drink, but you explain that you have an exam and you can't:

{% sentence
   japanese="(明|あ)(日|した)の(飲|の)み(会|かい)に(行|い)けないの？"
   translation="Can't you come for a drink tomorrow?" /%}

{% sentence
   japanese="(月|げつ)(曜|よう)(日|び)は(試|し)(験|けん)があるんだ。"
   translation="I have an exam Monday." /%}

As you can see, in answering the question **んだ is used at the end of the sentence**.

{% quote %}んだ usually cannot be translated with any words, it mainly changes the nuance in meaning of the sentence (explanation){% /quote %}

んだ expresses the fact that the answer **implies an explanation**. In fact, the phrase `I have an exam Monday.` is used to **explain the reason** why you can't come.

{% image
   alt="んだ in manga"
   caption="Here is an example of how んだ is used at the end of a sentence in this manga (Naruto) to emphasize an explanation. のだ / んだ is often used in manga."
   src="/grammar/のだ-spiegazioni-enfasi-grammatica-giapponese-italiano/noda-esempio-manga-giapponese.png"
   width=326
   height=306 /%}

{% image
   alt="んだ in videogame"
   caption="Here is another example of how んだ is used at the end of the sentence. In this case it is a video game (Final Fantasy VII Remake). As you can see, んだ is widely used in both manga and anime."
   src="/grammar/のだ-spiegazioni-enfasi-grammatica-giapponese-italiano/んだ-giapponese-italiano-esempio.jpeg"
   width=700
   height=197 /%}

### だ / です and のだ

This use of のだ expresses a similar meaning to だ (`da`) or です (`desu`) when taken individually (express a reason, `to be`).

The addition of の serves to accentuate the fact that what we say is a reason or explanation, **giving more emphasis to this meaning**.

### Use of んです: audio and explanation

{% premium
   content="VTJGc2RHVmtYMStWQTdSZnpmUUNEakM2eXVFYlhyQnVkLzlaeWVsNUt1Z0N2d2FaRXZ0WUI0WjcvZ2VQWFE5VFdjL0ZmdDBLd2ZyTWRBYWVSOG03TS9hUHB3RlVFVVpKK3NIM3BOTnNrbTBDdDdja0RPRkVodkpsUUZHbFVCQml3R2NwcUJhU0Vpd2xWK0Nka0NRbzFXSk1NSnFWRFczNUM2U2QyM1NMNWNnKzhOK0RiSzNoS1h5WCtSL3Z0Y0plYUFWM2lCMDlCQ0lESk1GczFWcS9yREplVllqMG5RMFhHWS9ETytNU1lCaTJCUzkweDFBdWE2MGF1ZXpHR0RwNGhiUkF3WmNXQ0RKcDI5MWtoK0lSK1E2UGEzM0Z4WGQ2b2lQZnlhTXFvNDd2LzR5N2p0N2FIU1JnT2xqTUd4YUd5a1pPazdoYWhIWW5RNFc3MFpocG9QRU9xOGlzRUJrazFPUGs3VlRMNXI4RXhKVHRwWjdHK0JQMnpRSis4OFZGY1lqcUhOdTkwMXBtZkdubUxqQVY5ZW9PSjNqbkEvODBXWTRIcFpmTDJxVDFtdEtac1FOS1Rlb2h5ZnJqZFB1NDU3clN6RG1YTTVLOXBEOTRSRDl2cE5nNDlDK2tkOFpoTC9kNm00SzZZVGFuYXo3TGVQSDBOcllDeUVVNEg5NlpjRHJra1B1aUFFdEVWSXlTVXdHalNRS2k3SGt6VVBKd3hHaElUZjd4N3dvcU4vK3BGTE12cnNMamszRzFWQUZ5NzYrYVFOVDFDay90dEZxWEY3ci9lUkhDNzZCOVRIVlA0dHJ5QnZtUVVRTk1vT1BNMTBEVitvUnFKRkwvQVpBSGFqVmpDUUluNlcwNWJxNVVMS1JEczUrWWcxQVJXbkx5RzJHRXIzMGZMRDh5SWpoajhFTTJDMXR3amFnZ0JTVnpXVkpFVnl1Zml5ZU0wSkpZaWVzVUwyOWhMbWJJWlZHckFQNW1LcGpuNzVwV2Q0cWJhSVRoYzJEVm1qY2xFVVF1ZG5Dai8zRS9mdU1mTnJ6R3lyUzBuYWtENGVndisrT3ludmdvVW9pZklVSy94QldESjFEMFVlczlnNy9BRHBpdW0weGVCWnNNY2djWmdkWWtWRjZCem9GV0RaQW45YjJIUEpGRGJDai9rQlcxek1ia1ZnWVNadnREbVZXQXFTZnB5OC9MbW1nTUllVDVmUWJQdEtHbnQzbExMZTJtNWMvbzlZdTNHVm5aZW42RkEzYlM5VE1OMWFUaWk2ZzhjQXhEV1VtVU9Ib3YrTldnKzkxNzNxQ0wrQTY0MVpVRW9mT3hZUzNxbVB1RklVMUhUdVF3M2Y5aFR0TjFyd2tqQ0ZkSldmZWRzeTg3MmhvcFd5bUNvNEdNVXdQdHBnYlhLU0FFMGpqUUo2a05McmRkR1RJTlBnK21IUTg1Q29kOWpiTXk0c0hwTFRSaFJjOWJqSERHYmgveFRaYmN0Zy9lb1VEM0ExbUJtV2VISG5TZzZuYmtpNHJOSCtKYjR5alRqOCtzblVBcElwTDJrY2VTTFR1VVdLRE1NRkh6NDRZQys0bEdRMFRJc3BzU2JGRT0="
   #a2870ca5-46f0-46e9-8d6c-7d02dfa14c27 /%}

## のだ to express emphasis

のだ is also used to express emphasis. It can be interpreted as an exclamation (adding the exclamation point `!`).

{% sentence japanese="それは(嘘|うそ)なんだ！" translation="This is a lie!" /%}


Learn Japanese Grammar: のだ（んだ） (noda). のだ（んだ） means "explanations", "emphasis". It is a JLPT N5 Japanese Grammar point.

のだ to express a reason or explanation

のだ（んだ） (noda) Meaning Japanese Grammar - Explanations

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のだ（んだ） (noda) Meaning Japanese Grammar - Explanations

のだ to express a reason or explanation

だ / です and のだ

Use of んです: audio and explanation

のだ to express emphasis

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