syuzyutu ha asita hazimarimasu.

It is pronounced:

しゅじゅつ は あした はじまります
shujutsu wa ashita hajimarimasu

A couple of pronunciation notes:

• 手術 is しゅじゅつ and can feel tricky because of the repeated ju-type sounds.
• The particle は is written ha but pronounced wa here.
• 始まります is hajimarimasu, with the ji sound like in jeep.

When は is used as a particle, it is pronounced wa.

So in this sentence:

• 手術は = shujutsu wa

This is one of the special pronunciation rules for Japanese particles. The spelling stays は, but the pronunciation changes to wa.

は marks the topic of the sentence.

So 手術は means something like:

• As for the surgery, ...
• Regarding the surgery, ...

In natural English, we usually would not translate は directly. It just helps organize the sentence in Japanese by telling you what the sentence is about.

This is an important verb pair:

• 始まる = to begin / to start (intransitive)
• 始める = to start something (transitive)

In this sentence, the surgery itself is the thing that begins, so Japanese uses 始まる:

• 手術は明日始まります。 = The surgery starts tomorrow.

If you used 始めます, it would imply that someone starts something:

• 医者が手術を始めます。 = The doctor starts the surgery.

So 始まります is correct because the sentence focuses on the surgery beginning.

Time words like 今日, 明日, 昨日, 毎日, and similar expressions often do not take に.

So:

• 明日始まります = starts tomorrow

This is completely normal Japanese.

You might see に with specific points in time, such as:

• 3時に = at 3 o’clock
• 月曜日に = on Monday
• 2026年に = in 2026

But with relative time words like 明日, に is usually not used.

Grammatically, 始まります is a non-past form. Japanese does not have a separate future tense the way English does.

That means 始まります can mean:

• starts
• will start

In this sentence, because of 明日, the meaning is clearly future:

• The surgery will start tomorrow.

So even though the verb form is not a special future tense, the time word makes the meaning future.

Yes, 手術が明日始まります is possible, but the nuance changes.

• 手術は明日始まります: As for the surgery, it starts tomorrow.
• 手術が明日始まります: The surgery is what starts tomorrow / slightly more focused on the surgery as the subject

In many everyday situations, は sounds natural if the surgery is already the topic of conversation.
が can sound a bit more like presenting new information or emphasizing what it is that starts.

For a learner, the original sentence with は is very natural and common.

The sentence is:

• 手術 = surgery
• は = topic marker
• 明日 = tomorrow
• 始まります = starts / will start

So the structure is roughly:

Topic + time + verb

A very literal breakdown would be:

• As for the surgery, tomorrow it begins.

Japanese often puts the verb at the end, which is one of the biggest differences from English.

Yes. 始まります is the polite ます-form of 始まる.

So this sentence is polite and appropriate in many normal situations, such as:

• speaking to a patient
• giving information professionally
• making a formal statement

A plain-form version would be:

• 手術は明日始まる。

That version is less polite and would be used in casual speech or informal writing.

Correct: normal Japanese writing usually does not use spaces.

So the sentence would normally be written as:

手術は明日始まります。

Learning materials often insert spaces to help beginners see the parts more clearly:

• 手術
• は
• 明日
• 始まります

Those spaces are just for study purposes.

Yes, Japanese word order is fairly flexible as long as the particles make the relationships clear and the verb stays near the end.

For example:

• 手術は明日始まります。
• 明日、手術は始まります。

Both are natural, though the emphasis can feel slightly different.

The original sentence is very standard and easy to understand.

Here are the readings:

• 手術 = しゅじゅつ
  
  • 手 = hand
  • 術 = technique / procedure
    Together, 手術 means surgery / operation
• 明日 = あした in this sentence
  It can also be read あす in some contexts.
• 始まります comes from the verb 始まる = はじまる

So the full reading is:

しゅじゅつはあしたはじまります。

It can mean either surgery or an operation in English.

In medical contexts, 手術 is the standard word for a surgical procedure. Depending on the translation, you might see:

• The surgery starts tomorrow.
• The operation begins tomorrow.

Both are fine. Surgery is often the more natural choice in everyday English, while operation can sound a little more formal or medical depending on context.