kensyuu ha asita hazimarimasu.

It is read:

けんしゅう は あした はじまります。

In normal Japanese writing, you would usually see it without spaces:

研修は明日始まります。

は marks the topic of the sentence.

So 研修は means something like:

• as for the training
• regarding the training

The sentence is then saying something about that topic: that it starts tomorrow.

This is a very common question.

The character は is normally read ha, but when it is used as the topic particle, it is pronounced wa.

So here:

• written: は
• pronounced: wa

This is just one of the standard special readings you have to memorize for particles.

Japanese often puts time expressions before the verb.

So the pattern here is:

• 研修は = topic
• 明日 = time
• 始まります = verb

This is very natural Japanese word order. In many cases, time words such as 今日, 明日, 来週, and 3時に appear before the main verb.

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

A few important points:

• dictionary form: 始まる
• polite form: 始まります
• non-past means it can refer to present or future, depending on context

In this sentence, because of 明日, it clearly refers to the future.

Japanese does not have a separate verb form that works exactly like the English future tense will start.

Instead, Japanese often uses the non-past form for both:

• habitual/present meanings
• future meanings

The time word 明日 tells you that this sentence is about the future, so 始まります is understood as will start.

This is about the difference between an intransitive and a transitive verb.

• 始まる = to begin, to start
  
  • something starts
• 始める = to start something
  
  • someone starts something

In this sentence, the training itself is the thing that begins, so 始まる is the correct verb.

Compare:

• 研修は明日始まります。
  The training starts tomorrow.

• 先生は明日研修を始めます。
  The teacher starts the training tomorrow.

Yes, が is possible, but the nuance changes.

• 研修は明日始まります。
  As for the training, it starts tomorrow.
  This sounds neutral and natural when the training is already the topic.

• 研修が明日始まります。
  The training starts tomorrow.
  This can sound more like presenting the training as the important subject, or giving new information.

For many learners, the simplest way to think about it is:

• は = topic / contrast / known context
• が = subject / newly identified information

Often yes, but the nuance can depend on context.

研修 can refer to things like:

• staff training
• job training
• orientation-style training
• a training seminar or workshop
• professional development training

So it is broader than just a single English word in some situations. The exact translation depends on what kind of training is being discussed.

Yes. 明日 has multiple possible readings depending on context and speaker.

Common readings include:

• あした
• あす
• みょうにち

In this sentence, あした is the most natural everyday reading.

Very roughly:

• あした = common conversational reading
• あす = also common, slightly more formal in some contexts
• みょうにち = quite formal or stiff in everyday speech

Japanese normally does not use spaces between words in ordinary writing.

So the normal written sentence is:

研修は明日始まります。

Spaces are often added in teaching materials to help beginners see the parts more clearly:

• 研修
• は
• 明日
• 始まります

So the spaces are just for learning convenience.