ininzyou wo zyunbisuru.

It is read:

いにんじょう を じゅんびする

• 委任状 = いにんじょう
• を = o
• 準備する = じゅんびする

In natural Japanese writing, it would normally appear without spaces:

委任状を準備する。

委任状 is a formal document that gives someone authority to act on your behalf.

Depending on context, it may be translated as:

• letter of authorization
• proxy form
• power of attorney or authorization letter in some situations

The exact English wording depends on the legal or administrative context. In everyday learning, it is enough to understand it as an authorization document.

を marks the direct object of the verb.

Here:

• 委任状 is the thing being prepared
• 準備する is the action, to prepare

So 委任状を準備する literally means:

prepare the authorization form

This is a very standard pattern:

noun + を + verb

For example:

• 資料を準備する = prepare the materials
• 部屋を掃除する = clean the room

Because 準備 is a noun that can combine with する to make a verb.

• 準備 = preparation
• 準備する = to prepare / to make preparations

This is a very common pattern in Japanese called a suru-verb:

• 勉強する = to study
• 運動する = to exercise
• 確認する = to confirm

So 準備する is not one indivisible word in origin; it is basically preparation + do.

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

So the basic order here is:

委任状 + を + 準備する
object + object marker + verb

This is different from English, where you would usually say:

prepare the authorization form

Japanese is often described as having an SOV pattern:

• subject
• object
• verb

But subjects are often omitted when they are understood from context.

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

So 委任状を準備する could mean:

• I will prepare the authorization form
• You should prepare the authorization form
• Please prepare the authorization form
• To prepare the authorization form

The exact meaning depends on where the sentence appears:

• in a checklist
• in instructions
• in a memo
• in a conversation
• in a procedural guide

So yes, the subject is omitted here.

する is the plain, dictionary form.
します is the polite form.

So:

• 委任状を準備する = plain style / dictionary style
• 委任状を準備します = polite style

The plain form is commonly used in:

• headings
• notes
• instructions
• lists of tasks
• dictionary examples

This sentence feels very natural as a short instruction or checklist item.

It can function as a complete sentence, but in real life it often feels like a task item, instruction, or procedural note.

For example, in a checklist:

• 委任状を準備する。
• 必要書類を確認する。
• 窓口に提出する。

In that kind of context, the plain form sounds natural and efficient. It is similar to English checklist language like:

• Prepare the authorization form
• Check the required documents
• Submit them at the counter

No. Normal Japanese writing usually does not use spaces between words.

So the standard written form is:

委任状を準備する。

Learner materials often add spaces to make the structure easier to see:

• 委任状 / を / 準備する

But in actual Japanese text, the spaces would usually be removed.

Yes, very often.

Both can mean to prepare.

• 準備する focuses a bit more on making preparations
• 用意する often feels a bit more like getting something ready or having it ready

In many practical contexts, both are fine:

• 委任状を準備する
• 委任状を用意する

The difference is small here, and both sound natural.

It is not an everyday casual word for all situations, but it is common in:

• legal settings
• government procedures
• banking
• real estate
• administrative paperwork

So it is a useful word if you deal with formal documents in Japanese, but it is more specialized than a basic everyday noun like 本 or 車.

Yes, depending on context.

By itself, 委任状を準備する。 is not an explicit command form like 準備しろ or 準備してください. However, in a manual, checklist, or instruction sheet, it can function like an instruction:

Prepare the authorization form.

Japanese often uses the plain form in procedural writing where English might use the imperative.

This is more advanced, but the kanji give a clue to the meaning:

• 委 = entrust
• 任 = duty, responsibility, appointment
• 状 = document, written form

So 委任状 is literally a document of entrusting authority/responsibility.

You do not need to analyze every kanji every time, but it can help you remember that this is a formal written authorization document.