kare ha oozei no mae de zikosyoukaisuruno wo hazukasigaru.

は marks 彼 as the topic of the sentence.

So 彼は... means something like As for him, ... or He ... in natural English.

It does not simply mean subject in a mechanical way; it tells you that the sentence is about him. In this sentence, everything that follows is describing his tendency or behavior.

大勢 means a large number of people, many people, or a crowd.

So:

• 大勢 = many people / a crowd

In this sentence, 大勢の前 means in front of many people or before a crowd.

A learner may expect 大勢の人, and that is also possible, but 大勢 by itself already refers to a lot of people.

Here, の links two nouns:

• 大勢 = a crowd, many people
• 前 = front / before

So 大勢の前 literally means the front of a crowd or more naturally in front of many people.

This is a very common noun-linking use of の:

• 学校の先生 = the school’s teacher / a teacher at school
• 友達の家 = a friend’s house
• 大勢の前 = before a crowd

で marks the place or situation where an action happens.

Here, the action is 自己紹介する.

So:

• 大勢の前で = in front of many people, as the setting in which the self-introduction happens

Compare:

• 公園で遊ぶ = play in the park
• みんなの前で話す = speak in front of everyone

So で is not just physical location here; it marks the context in which the action takes place.

自己紹介する means to introduce oneself.

It is made from:

• 自己紹介 = self-introduction
• する = to do

Many Japanese nouns can combine with する to make verbs. These are often called suru-verbs.

Examples:

• 勉強する = to study
• 運動する = to exercise
• 自己紹介する = to introduce oneself

So 自己紹介 is the noun, and 自己紹介する is the verb phrase.

This is one of the most important grammar points in the sentence.

Here, 自己紹介する is not being used directly as the main action. Instead, the whole action introducing oneself is being turned into a noun-like phrase by の.

So:

• 自己紹介する = to introduce oneself
• 自己紹介するの = the act of introducing oneself

Then that noun-like phrase gets marked by を as the thing he feels embarrassed about:

• 自己紹介するのを恥ずかしがる = to feel embarrassed about introducing oneself

So this is not the same structure as:

• 自己紹介をする = to do a self-introduction

That would simply mean to introduce oneself, not to be embarrassed about doing it.

This の is a nominalizer. It turns the verb phrase into something noun-like.

So:

• 自己紹介する = to introduce oneself
• 自己紹介するの = introducing oneself / the act of introducing oneself

English often uses -ing for this idea. Japanese often uses の or こと.

In this sentence, の lets the action become the object of 恥ずかしがる.

Because the whole phrase 自己紹介するの is functioning as the object of 恥ずかしがる.

So the structure is:

• [自己紹介するの] を 恥ずかしがる
• feel embarrassed about [introducing oneself]

Even though English uses about, Japanese marks the thing directly with を here.

This is a very common pattern when an action is nominalized and treated as the object of another verb.

This is a very common learner question.

• 恥ずかしい = embarrassed / शर्मful / feeling embarrassed
• 恥ずかしがる = to act embarrassed, to show embarrassment, to be shy about something

The verb ending -がる is often used with feelings to describe how someone else appears to feel or shows that feeling.

That is why 恥ずかしがる is especially natural with a third-person subject like 彼.

So:

• 彼は恥ずかしい can sound unnatural in many contexts if you are directly stating his internal feeling
• 彼は恥ずかしがる is more natural for He is shy / He acts embarrassed / He tends to feel embarrassed

In this sentence, it has the sense that he is shy about introducing himself in front of many people.

Japanese often treats other people’s feelings differently from your own.

You can directly say your own feeling:

• 私は恥ずかしい = I’m embarrassed

But when talking about someone else, Japanese often avoids directly stating their internal feelings unless there is evidence, context, or a special form. So Japanese often uses forms like:

• 恥ずかしがる
• 〜そうだ
• 〜ようだ

So 彼は自己紹介するのを恥ずかしがる sounds natural because it describes his observable tendency: he acts shy or embarrassed about doing it.

Yes, the dictionary form here gives a non-past meaning, but in this sentence it often sounds more like a general tendency or habitual behavior.

So the sentence does not necessarily mean he is embarrassed right this second. It can mean:

• he is the kind of person who gets embarrassed about it
• he tends to be shy about introducing himself in front of crowds

If you wanted a past meaning, you could say:

• 彼は大勢の前で自己紹介するのを恥ずかしがった。
• He was embarrassed / acted embarrassed about introducing himself in front of many people.

Yes. Unless something else is stated, the understood subject of 自己紹介する is the same 彼 from the beginning of the sentence.

So the sentence means:

• He is embarrassed about his own introducing himself in front of many people.

Japanese often leaves repeated subjects unstated when they are understood from context.

Yes, 自己紹介することを恥ずかしがる is grammatically possible.

However, の often sounds a bit more direct and action-focused in sentences like this. It can feel slightly more natural when talking about a concrete action or experience.

Very roughly:

• の often feels closer to the actual act
• こと can sound a little more abstract

Both can work, but 自己紹介するのを恥ずかしがる is very natural.

Both are natural, but they emphasize slightly different things.

• 人前で = in front of people / in public
• 大勢の前で = in front of many people / before a crowd

So 大勢の前で specifically highlights that there are a lot of people, not just people in general.

If the idea is stage fright or discomfort with crowds, 大勢の前で is a good choice.

A useful breakdown is:

• 彼は = as for him
• 大勢の前で = in front of many people
• 自己紹介するのを = introducing himself / the act of introducing himself
• 恥ずかしがる = feels shy about it / is embarrassed by it

So the pattern is basically:

A は [place/situation] で [action] の を 恥ずかしがる

In smoother English: He is shy about introducing himself in front of a crowd.