ihan ni kiduita.

It is read いはん に きづいた.

• 違反 = いはん
• 気づいた = きづいた

Also, the normal written form would usually be 違反に気づいた。 without spaces.

Because 気づく normally uses に for the thing you notice or become aware of.

The basic pattern is:

• X に気づく = to notice X
• to become aware of X

So 違反に気づいた follows the normal grammar of 気づく.

Normally, no. With 気づく, standard Japanese uses に, not を.

So:

• natural: 違反に気づいた
• not standard for learners: 違反を気づいた

This is a good example of how Japanese and English do not always match directly. English says notice something, but Japanese says something に 気づく.

The dictionary form is 気づく.

気づいた is the plain past form of that verb:

• 気づく → 気づいた

So the sentence is in the past tense.

気づく is a godan verb ending in -く. Its plain past form changes like this:

• -く → -いた

So:

• 気づく → 気づいた

This is the same pattern as:

• 書く → 書いた
• 聞く → 聞いた

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

So 違反に気づいた could mean:

• I noticed the violation
• he noticed the violation
• she noticed the violation
• they noticed the violation

You have to rely on the surrounding context to know who the subject is.

It can be either.

気づく means to become aware of something. Depending on the situation, that may sound more like:

• notice
• realize

So this sentence could feel like:

• noticing a violation that was there
• realizing that something was a violation

The core idea is becoming aware.

違反 is a noun meaning violation, breach, or infraction.

It is often used in somewhat formal contexts, such as rules, laws, or agreements.

Examples:

• 交通違反 = traffic violation
• ルール違反 = rule violation
• 契約違反 = breach of contract

So 違反 sounds more formal than a word like ミス.

Yes, it can be natural, especially if the context is already understood.

Japanese often uses short sentences like this in:

• conversation
• narration
• reports
• written notes

But by itself, it leaves some things unstated, such as:

• who noticed it
• what the violation was
• in what situation it happened

So it is grammatically fine, but context is important.

They are probably there just to help learners see the parts of the sentence.

In normal Japanese writing, you would usually write:

違反に気づいた。

Japanese does not normally use spaces between words the way English does.