dairinin ga sinseisyo wo teisyutusuru.

It is read:

だいりにん が しんせいしょ を ていしゅつする。

Word readings:

• 代理人 = だいりにん
• 申請書 = しんせいしょ
• 提出する = ていしゅつする

They are particles that show the role of each noun in the sentence.

• が marks the subject: 代理人が = the representative/agent is the one doing the action
• を marks the direct object: 申請書を = the application form is what is being submitted

So the structure is:

代理人 が 申請書 を 提出する
subject + object + verb

Both can mark something like the English topic/subject, but they are not the same.

• が points out who does the action
• は marks the topic and often gives a contrast or frames what the sentence is about

In this sentence, が simply identifies 代理人 as the doer of 提出する.

If you said 代理人は申請書を提出する, it would sound more like:

• As for the representative, they submit the application form
• or it could imply contrast, depending on context

So が is a very natural choice when you are just stating who performs the action.

提出する is a suru-verb.

That means:

• 提出 is a noun meaning something like submission
• adding する turns it into a verb: to submit

This pattern is very common in Japanese, especially with formal or Sino-Japanese vocabulary.

Examples:

• 提出する = to submit
• 勉強する = to study
• 連絡する = to contact

提出する is more formal and is especially common for documents, paperwork, reports, and official procedures.

• 出す is a more general verb meaning to put out / send / hand in / submit
• 提出する specifically sounds like formal submission

Since 申請書 is an application form, 提出する fits very naturally.

It is in the non-past form, which can mean either:

• present/habitual, depending on context
• future

Japanese does not separate present and future the way English often does.

So 提出する could mean:

• submits
• will submit

You know which one is intended from context.

Japanese is basically an SOV language:

Subject + Object + Verb

So:

• 代理人 = subject
• 申請書 = object
• 提出する = verb

Putting the verb at the end is normal in Japanese.

It can change more than in English because particles show each word’s role.

For example, these can both work:

• 代理人が申請書を提出する
• 申請書を代理人が提出する

Both still mean roughly the same thing because:

• が still marks the subject
• を still marks the object

However, changing the order changes the focus or emphasis a little. The original order is very straightforward and neutral.

Japanese does not have articles like English a or the.

So 代理人 could mean:

• a representative
• the representative

And 申請書 could mean:

• an application form
• the application form

Which one is intended depends on the context.

By itself, 代理人 does not clearly show singular or plural.

Depending on context, it could mean:

• a representative
• the representative
• representatives

Japanese nouns usually do not change form for plural the way English nouns do.

If needed, Japanese can make plurality clearer with context or extra words, but often it is left unstated.

Yes. Change 提出する to 提出します.

So the polite version is:

代理人が申請書を提出します。

This is more appropriate in many everyday formal situations.

The original 提出する is plain form, which is used in:

• dictionary form
• written explanations
• neutral statements
• casual/plain-style grammar examples

代理人 is a fairly formal word. It usually means someone acting on behalf of another person, such as:

• an agent
• a representative
• a proxy

The exact English translation depends on context. In legal or administrative contexts, 代理人 often refers to someone officially authorized to act for someone else.

Yes, but Japanese usually prefers the active sentence unless there is a reason to use passive.

Active:

• 代理人が申請書を提出する。

Passive:

• 申請書が代理人によって提出される。

The passive version is grammatically fine, but it sounds more formal and less direct. The active sentence is more natural in many cases.

This is very common in Japanese.

• 提出 is the main lexical part and is written in kanji
• する is a very common verb and is usually written in hiragana

So 提出する mixes kanji and hiragana in a normal way. This happens all the time in Japanese verbs and grammar patterns.