gozentyuu ni zimu wo simasu.

It is read:

ごぜんちゅう に じむ を します。

In normal Japanese writing, it would usually appear without spaces:

午前中に事務をします。

The spaces here are just for learners.

午前中 means during the morning or in the course of the morning.

A useful comparison:

• 午前 = a.m. / morning in a more clock-based sense
• 午前中 = during the morning, emphasizing the span of time before noon

So 午前9時 is 9 a.m., while 午前中に means sometime in the morning.

に marks the time when something happens.

So:

• 午前中に = in the morning / during the morning

It tells you when the action takes place.

In this sentence, に connects the time expression 午前中 to the action します.

を marks the direct object of the verb.

Here, 事務 is the thing being done, and します means do. So:

• 事務をします = do office work / do clerical work

This is a very common Japanese pattern:

• noun + を + します

Examples:

• 勉強をします = do studying / study
• 仕事をします = do work
• 運動をします = do exercise

Japanese often uses する with nouns to create the idea of doing X.

So instead of always needing a separate verb, Japanese often says:

• 事務をする = to do clerical work
• 勉強する = to study
• 掃除する = to clean

With 事務, using をする is a normal way to express the activity.

事務 is a noun. It usually refers to office work, clerical work, or administrative tasks.

So in this sentence, it does not mean a specific office building or department. It refers to the type of work being done.

Japanese often leaves out the subject when it is understood from context.

So 午前中に事務をします。 could mean:

• I do office work in the morning
• We do office work in the morning
• He/She does office work in the morning

The listener usually understands who the subject is from the conversation or situation.

This is very normal in Japanese.

します is the polite non-past form of する.

That means it can mean either:

• do
• will do

depending on context.

Its plain form is:

• する

So:

• 事務をします = polite
• 事務をする = plain

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

The basic neutral order here is:

• 午前中に 事務を します

But you may also hear:

• 事務を午前中にします

That said, the original order is very natural and easy for learners to follow.

The most important thing is keeping the particles correct:

• 午前中に
• 事務を

Yes, and it changes the nuance a little.

• 午前中に事務をします = simply states when the action happens
• 午前中は事務をします = puts the morning in contrast or as the topic, something like As for the morning, I do office work

Using は can suggest a contrast, such as:

• In the morning I do office work, but in the afternoon I do something else

So に is a straightforward time marker, while は gives a topic or contrast feeling.

No. Standard Japanese is normally written without spaces.

So the natural written sentence is:

午前中に事務をします。

Learner materials often add spaces to make it easier to see the parts of the sentence.