kare ha daigaku de seizi wo benkyousuru.

は is the topic marker here. It tells you that 彼 is the topic of the sentence: as for him...

So:

• 彼は = as for him / he

Even though the character is normally read ha, when it is used as the particle は, it is pronounced wa. This is just a special pronunciation rule for the particle.

In this sentence, は marks 彼 as the topic, not just the grammatical subject.

• 彼は大学で政治を勉強する。 = As for him, he studies politics at university.

If you used が instead, the sentence would sound different in nuance. が often identifies or emphasizes the subject more directly.

Very roughly:

• は = talks about someone/something already being discussed, or sets the topic
• が = points out who does the action, often with more focus

At a beginner level, it is enough to understand that 彼は is a very natural way to say he as the topic of the sentence.

で marks the place where an action happens.

Here, the action is 勉強する (to study), and the place where that studying happens is 大学 (university/college).

So:

• 大学で = at university / in college / at college

This is different from particles like に, which often mark a destination, time, or location of existence depending on the sentence.

In this sentence, because someone is doing an action at a place, で is the correct particle.

を marks the direct object of the verb.

The verb is 勉強する (to study), and the thing being studied is 政治 (politics).

So:

• 政治を勉強する = to study politics

This works much like English word order, except Japanese uses a particle to show the object clearly.

勉強 is a noun meaning study or studying, and する means to do.

When you combine them:

• 勉強する = to study

This is a very common pattern in Japanese:

• 勉強する = study
• 運動する = exercise
• 仕事する = do work / work

These are often called suru-verbs.

So even though English has a single verb study, Japanese often expresses it as study + do.

It can mean any of those depending on context.

The plain non-past form 勉強する can express:

• habitual action: he studies
• general truth / regular activity: he studies politics at university
• future action: he will study

In a sentence like this, the most natural interpretation is usually:

• He studies politics at university
• or He is studying politics at university

Japanese often relies on context where English forces you to choose a tense more specifically.

Japanese normally follows Subject/Topic - Object - Verb order, and the verb usually comes at the end.

So this sentence is structured like:

• 彼は = as for him
• 大学で = at university
• 政治を = politics
• 勉強する = studies

A very literal order in English would be:

• As for him, at university politics studies

That sounds unnatural in English, but it shows the Japanese structure.

The key point: Japanese verbs typically go at the end.

No. Japanese is normally written without spaces.

So the sentence would normally appear as:

彼は大学で政治を勉強する。

Spaces are often added in beginner materials to make it easier to see the words and particles.

Not always.

Although 彼 does mean he, Japanese often avoids pronouns when they are clear from context. In real conversation, people very often:

• omit the subject entirely
• use the person’s name
• use a role/title instead

So while 彼は大学で政治を勉強する。 is grammatically correct and useful for learning, in natural conversation a speaker might simply say:

• 大学で政治を勉強する。

if it is already clear who they are talking about.

Yes. 大学 is commonly translated as university, but in many beginner translations it may also be given as college depending on context.

So:

• 大学 = university / college

If you want the more literal and standard dictionary meaning, university is usually the safest choice.

A good way is to break it up by particles:

• 彼は
  彼 = he
  は = topic marker

• 大学で
  大学 = university
  で = at/in the place where the action happens

• 政治を
  政治 = politics
  を = direct object marker

• 勉強する
  = study / studies / will study

So the sentence pattern is:

Topic + place of action + object + verb

That is a very common Japanese sentence pattern.

Yes. The polite form of 勉強する is 勉強します.

So the polite version is:

彼は大学で政治を勉強します。

This is more appropriate in many everyday situations, especially when speaking politely.

The version with 勉強する is the plain form, which is common in dictionaries, casual speech, and textbook examples.

It is read:

かれ は だいがく で せいじ を べんきょうする。

Word by word:

• 彼 = かれ
• は = pronounced わ as a particle
• 大学 = だいがく
• で
• 政治 = せいじ
• を = often pronounced close to o
• 勉強する = べんきょうする