kaigisitu wo tehaisita.

It is pronounced:

かいぎしつ を てはいした
Romanization: kaigishitsu o tehai shita

A few notes:

• 会議室 = かいぎしつ
• The particle を is written wo, but in modern Japanese it is usually pronounced o
• 手配した = てはいした

を marks 会議室 as the direct object of the verb.

So in this sentence:

• 会議室 = the meeting room
• を = marks it as the thing being arranged
• 手配した = arranged

A very literal breakdown would be:

meeting room + object marker + arranged

Because Japanese normally places the main verb at the end of the clause.

This is one of the biggest word-order differences from English. Japanese often follows a subject–object–verb pattern, while English usually uses subject–verb–object.

So:

• English: I arranged the meeting room
• Japanese: (I) meeting room arranged

Even though that sounds strange in English, it is normal in Japanese.

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

So 会議室を手配した could mean:

• I arranged the meeting room
• We arranged the meeting room
• He/She arranged the meeting room

The listener usually figures it out from the situation.

This is very common in Japanese, and you do not need to include a subject unless it is important or unclear.

The dictionary form is 手配する.

This is a する-verb:

• dictionary form: 手配する = to arrange
• past plain form: 手配した = arranged / did arrange

So した here is the past form of する.

Not exactly.

手配する means to arrange, to make arrangements for, or to set something up. It can sound a little more formal or businesslike.

予約する means to reserve or to book.

So:

• 会議室を予約した = I booked/reserved a meeting room
• 会議室を手配した = I arranged a meeting room

In many contexts, the English translation may be similar, but 手配する can suggest handling the arrangements more broadly, not just making a reservation.

した is the plain past form.

Compare:

• 手配した = plain past
• 手配しました = polite past

Both mean basically the same thing, but the level of politeness is different.

Use 手配した in casual speech, plain writing, or when speaking informally.
Use 手配しました in polite conversation, business situations, or when speaking respectfully.

Since 手配する is a fairly formal word, in real life you will often hear 手配しました.

It can mean either one, depending on context.

Japanese does not use articles like a, an, and the the way English does. So 会議室 by itself does not tell you whether it is:

• a meeting room
• the meeting room
• sometimes even meeting rooms in the right context

You determine that from the situation.

The version with spaces is helpful for learners, but normal Japanese is usually written without spaces:

会議室を手配した。

So:

• learner-friendly: 会議室 を 手配した。
• normal writing: 会議室を手配した。

Japanese uses particles and script patterns to show structure, so spaces are usually unnecessary.

Usually, 会議室を手配した is the neutral, standard way to say it.

If you say 会議室は手配した, the は adds a contrastive or topical nuance, something like:

• As for the meeting room, I arranged it
• I arranged the meeting room, at least

That version would usually appear in a context where you are contrasting it with something else, for example:

会議室は手配したが、資料はまだだ。
I arranged the meeting room, but the materials aren’t ready yet.

So for a simple standalone sentence, を is the natural choice.

Yes. That is one reason 手配した is useful.

Depending on context, it can imply things like:

• securing the room
• organizing the details
• making the necessary arrangements
• handling logistics

So it can be broader than simply booking it.

That broader nuance is often important in business Japanese.

Yes. 会議室 is one noun.

It is made up of:

• 会議 = meeting, conference
• 室 = room

Together, 会議室 means meeting room or conference room.

This is very common in Japanese: several kanji combine into one compound noun.

Yes, absolutely.

In natural English, arranged for a meeting room often sounds smoother, because English usually says you arrange for something rather than arrange the thing directly.

So depending on context, these can all work:

• I arranged a meeting room
• I arranged for a meeting room
• I booked a meeting room
• I made arrangements for a meeting room

The Japanese sentence itself does not force only one of these translations.