kakariin ga syorui wo syorisimasita.

It is read:

かかりいん が しょるい を しょりしました。

Word by word:

• 係員 = かかりいん
• が = が
• 書類 = しょるい
• を = pronounced お
• 処理しました = しょりしました

So the whole sentence sounds like:

かかりいん が しょるい を しょりしました。

係員 usually means a staff member, clerk, attendant, or person in charge in some workplace or public-service setting.

It is a fairly formal/job-related word, not a casual word for just any person. Depending on context, it could refer to:

• a station attendant
• an office clerk
• a service desk staff member
• an employee handling a specific task

So it has a more specific nuance than just person.

が marks the grammatical subject of the sentence.

In this sentence, 係員が shows that the staff member is the one who performed the action.

A very natural learner question is: why not は?

The basic difference is:

• が focuses on who did it
• は marks the topic, often something already being talked about

So:

• 係員が書類を処理しました。
  = The staff member processed the documents / It was the staff member who processed the documents.

• 係員は書類を処理しました。
  = As for the staff member, they processed the documents.

Both can be grammatical, but が is a straightforward choice when identifying the subject of the action.

を marks the direct object of the verb—the thing that receives the action.

Here:

• 書類 = the documents / paperwork
• を = marks that those documents are what got processed

So 書類を処理しました means processed the documents.

This is very common in Japanese:

• 本を読みました = read a book
• 水を飲みました = drank water
• 書類を処理しました = processed the documents

Also, although the particle is written を, it is usually pronounced お in modern Japanese.

Japanese normally uses SOV word order:

• Subject
• Object
• Verb

So this sentence follows a very typical Japanese pattern:

• 係員 = subject
• 書類 = object
• 処理しました = verb

That is why the verb comes at the end.

In English, you would say:

• The staff member processed the documents.

In Japanese, the normal order is:

• Staff member + documents + processed

処理しました is the polite past form of 処理する.

Breakdown:

• 処理 = processing / handling
• する = to do
• 処理する = to process, to handle
• 処理しました = processed

This is a very common pattern in Japanese:

• 勉強する → 勉強しました = studied
• 電話する → 電話しました = called
• 処理する → 処理しました = processed

So 処理 is a noun, but when combined with する, it becomes a verb.

Yes. It is in the polite past form because of ました.

• 処理しました = polite
• 処理した = plain/casual

So the sentence is suitable for neutral, polite speech, writing, workplace language, and textbook Japanese.

Compare:

• 係員が書類を処理しました。 = polite
• 係員が書類を処理した。 = plain

The plain form is not necessarily rude, but it is less formal.

It can be singular or plural, depending on context.

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

So 書類 could mean:

• a document
• documents
• paperwork

The translation depends on context.

That means this sentence could refer to:

• one document
• several documents
• a set of paperwork

Japanese often leaves number unspecified unless it is important.

Japanese does not have articles like English a, an, and the.

So a noun like 係員 or 書類 can mean:

• a staff member
• the staff member
• staff members
• the documents
• some documents

Context tells you which one is intended.

That is why a short Japanese sentence can sound less specific than its English translation unless the context is clear.

Yes, to some extent, because the particles show each word’s role.

The most neutral order is:

• 係員が書類を処理しました。

But you may also see:

• 書類を係員が処理しました。

This still means roughly the same thing, because:

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

However, changing the order changes the focus or emphasis.
For example, 書類を係員が処理しました can sound like it is emphasizing who processed the documents.

So Japanese word order is more flexible than English, but not completely free.

Yes. Japanese often omits information that is clear from context.

So if everyone already knows who did the action, you could simply say:

• 書類を処理しました。

That would mean something like:

• Processed the documents.
• (Someone) processed the documents.
• I/they/he/she processed the documents.

The subject is often left out in Japanese if it is understood from the situation.

In modern standard Japanese, the particle を is usually pronounced お, not a strong wo.

So:

• 書類を sounds like しょるいお

In romanization, it is often still written as wo because that reflects the traditional spelling and helps show that it is the object particle.

So you may see:

• shorui o
• or sometimes shorui wo

But in actual pronunciation, o is the normal expectation.

This is one of the most common and important questions in Japanese.

Compare:

• 係員が書類を処理しました。
• 係員は書類を処理しました。

With が, the sentence tends to present the staff member as the one who did the action. It can feel more like identifying the subject.

With は, the sentence makes the staff member the topic and says something about them. It can sound more contrastive depending on context, like:

• As for the staff member, they processed the documents.

Very roughly:

• が = who did it?
• は = speaking of this person...

In a simple out-of-the-blue statement, が is perfectly natural for marking the subject.

It actually could be 処理をしました, but 処理しました is more compact and common.

Compare:

• 書類を処理しました。
• 書類の処理をしました。

The first one directly uses 処理する as a verb:
processed the documents

The second one treats 処理 more like a noun phrase:
did the processing of the documents

So 処理しました is the simpler and more natural choice in many cases.

It is a する-verb.

Japanese has many nouns of Chinese origin that can combine with する to make verbs. These are often used in formal, academic, business, or technical language.

Examples:

• 勉強する = to study
• 連絡する = to contact
• 確認する = to confirm
• 処理する = to process

So if you learn 処理, it is very useful to also learn:

• 処理する
• 処理します
• 処理した
• 処理して
• 処理できる

as part of the same verb family.

It sounds fairly neutral-to-formal because of both the vocabulary and the polite verb ending.

Reasons:

• 係員 is a workplace/service-type word
• 処理する is somewhat formal and administrative
• ました is polite

So this sentence sounds natural in contexts like:

• office work
• customer service
• official announcements
• reports
• textbooks

It is not unnatural in everyday Japanese, but it does have a slightly administrative or businesslike tone because of 書類 and 処理.