sinnyuusyain wo kangeisuru.

It is read:

• 新入社員 = しんにゅうしゃいん
• を = を (pronounced o)
• 歓迎する = かんげいする

So the full sentence is:

しんにゅうしゃいん を かんげいする。

Also, in normal Japanese writing, you usually would not put spaces: 新入社員を歓迎する。

新入社員 means new employee, new hire, or new recruit.

It is made up of:

• 新入 = newly entering
• 社員 = company employee

So this word usually refers specifically to someone who has newly joined a company, not just any person who is “new” in a general sense.

を marks the direct object of the verb.

In this sentence, 歓迎する means to welcome, and the thing being welcomed is 新入社員.

So:

• 新入社員 = the new employees
• を = marks them as the object
• 歓迎する = welcome

A helpful way to think about it is: [object] + を + [verb]

So 新入社員を歓迎する literally has the structure: new employees + object marker + welcome

歓迎 by itself is a noun meaning welcome.

To make it into a verb, Japanese often adds する, which means to do. This creates a suru-verb.

So:

• 歓迎 = welcome
• 歓迎する = to welcome

This is very common in Japanese, especially with words of Chinese origin:

• 勉強 → 勉強する = study
• 運動 → 運動する = exercise
• 歓迎 → 歓迎する = welcome

歓迎する is the plain form (dictionary form) of the verb.

歓迎します is the polite form.

So both are correct, but they have different tones:

• 歓迎する。 = plain, neutral, often used in dictionaries, headings, written statements, or casual style
• 歓迎します。 = polite, more suitable in conversation or polite writing

A learner often sees plain form in example sentences because it is the basic form of the verb.

Japanese non-past verbs can cover both present and future, depending on context.

So 歓迎する can mean things like:

• welcomes
• will welcome
• to welcome (as a dictionary form)

Without context, the sentence feels like a general statement, headline, slogan, or description rather than a specific moment happening right now.

The subject is omitted, which is very common in Japanese.

Japanese often leaves out information that is understood from context. So this sentence does not explicitly say who is welcoming the new employees.

Depending on context, the hidden subject could be:

• the company
• we
• our team
• everyone

If you wanted to state it clearly, you could say:

• 会社は新入社員を歓迎する。 = The company welcomes new employees.
• 私たちは新入社員を歓迎する。 = We welcome new employees.

Yes. In Japanese, this is a perfectly valid complete sentence.

Because Japanese often drops subjects and other predictable information, a sentence can still be complete as long as the intended meaning is clear from context.

So 新入社員を歓迎する。 is natural Japanese, especially in:

• slogans
• company statements
• written descriptions
• example sentences

It is in the plain style, not the polite ます style.

That does not automatically mean it is casual in the same way as casual spoken English. Plain form is also widely used in:

• dictionaries
• written explanations
• headlines
• essays
• company policies
• statements of principle

So this sentence can sound somewhat neutral or written, depending on context.

If you wanted a more directly polite version, you could say:

新入社員を歓迎します。

Yes, Japanese word order is more flexible than English because particles show each word’s role.

The most neutral order here is:

新入社員を歓迎する。

But with more context, other orders are possible, such as:

• 会社は新入社員を歓迎する。
• 新入社員を会社は歓迎する。

Both can work, though the nuance or emphasis may change.

Still, the basic and most common order is: object + を + verb

And the verb usually comes at the end.

In this sentence, を is the natural particle because 新入社員 is the direct object of 歓迎する.

Using a different particle would change the structure or make it incorrect for this meaning.

For example:

• 新入社員が歓迎する would mean the new employees welcome [someone]
• 新入社員に歓迎する is not the normal way to express this meaning

So if you mean welcome the new employees, を is the correct choice.

Japanese nouns usually do not mark singular vs. plural clearly.

So 新入社員 can mean:

• a new employee
• new employees

You know which one is intended from context.

In English, you must choose singular or plural, but Japanese often leaves that unspecified.

They are probably there just to help learners see the parts clearly:

• 新入社員
• を
• 歓迎する

In normal Japanese writing, spaces are usually not used between words like this.

So the standard written form is:

新入社員を歓迎する。

Yes, very much so.

Because it is short, direct, and in plain form, it can sound like:

• a company policy statement
• a heading
• a slogan
• a caption
• a simple example sentence

For example, on a company website or poster, 新入社員を歓迎する could feel like: We welcome new employees or Welcoming new hires.

So the sentence may feel broader or more declarative than a normal spoken sentence in daily conversation.