apaato ni sunde imasu.

に marks the place where someone lives, exists, or is located in this kind of sentence.

So:

• アパートに住んでいます = (I) live in an apartment
• literally, live at/in an apartment

With 住む, the place you live is commonly marked by に.

Examples:

• 東京に住んでいます。 = I live in Tokyo.
• 日本に住んでいます。 = I live in Japan.

You may also sometimes see 住んでいるところ or other structures, but for a basic sentence like this, に is the normal particle.

This is a very common question, because in English we simply say I live.

In Japanese, 住んでいます is the natural way to describe your current living situation. It uses the -ている form, which often expresses an ongoing state or continuing situation.

So:

• 住みます often sounds like will live / live (in a general or formal sense)
• 住んでいます means am living / live

For real-life self-introductions, Japanese usually prefers:

• アパートに住んでいます。
• 東京に住んでいます。

rather than 住みます.

So even though English uses the simple present, Japanese often uses -ている for this kind of continuing state.

Here, -ている shows a state that continues over time.

With some verbs, -ている means an action is happening right now:

• 食べている = is eating

But with other verbs, it describes a resulting or ongoing state:

• 結婚している = is married
• 知っている = knows
• 住んでいる = lives

So 住んでいます does not usually mean is in the middle of moving in right now. It means lives or is living there as an ongoing condition.

It comes from the verb 住む.

Step by step:

1. Dictionary form: 住む
2. て-form: 住んで
3. Add います: 住んでいます

Why んで?

For many -む, -ぶ, and -ぬ verbs, the て-form changes like this:

• 読む → 読んで
• 遊ぶ → 遊んで
• 死ぬ → 死んで
• 住む → 住んで

So 住む → 住んでいます is a standard conjugation pattern.

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

So:

• 私はアパートに住んでいます。
• アパートに住んでいます。

can both mean I live in an apartment, depending on the situation.

If you are answering a question about yourself, introducing yourself, or the context already makes the subject obvious, Japanese usually omits it.

This is very natural. In fact, repeating 私は too often can sound unnatural or overly explicit.

Not exactly.

アパート is a loanword from English, but in Japanese it usually refers to a relatively modest apartment building, often smaller or less expensive.

Japanese also has:

• マンション = an apartment building or condo-style building, often more modern or sturdier than an アパート

So the meanings do not match English perfectly.

Very roughly:

• アパート = small rental apartment / apartment building
• マンション = larger or more solid apartment/condo building

This is a cultural vocabulary point, not a grammar point, but learners often wonder about it.

The spaces are just for learners.

Normal Japanese is usually written without spaces, so this sentence would normally appear as:

• アパートに住んでいます。

Textbooks and beginner materials sometimes insert spaces to make it easier to see the words and particles:

• アパート　に　住んで　います。

But in standard Japanese writing, those spaces are generally not used.

Yes. The most common normal writing is:

• アパートに住んでいます。

The verb contains kanji:

• 住む = to live, reside
• 住んでいます = live / am living

So the sentence is already partly in standard form if written as:

• アパートに住んでいます。

You could also see the casual form:

• アパートに住んでいる。

アパート is usually written in katakana because it is a loanword.

The difference is mainly politeness.

• 住んでいます = polite
• 住んでいる = casual/plain

Examples:

• アパートに住んでいます。 = polite, suitable in class, with strangers, or in formal situations
• アパートに住んでいる。 = casual, used with friends, family, or in plain-style writing

Both mean basically the same thing.

Normally, no. アパートに住んでいます is the natural form.

With 住む, the place of residence is usually marked by に.

• 東京に住んでいます。
• アパートに住んでいます。

Using で would sound unnatural here, because で usually marks the place where an action takes place, while 住む is treated as living/residing in a place rather than simply doing an action there.

So for basic Japanese, use:

• place + に + 住んでいます

By itself, it can refer to different subjects depending on context.

Because Japanese often omits the subject, アパートに住んでいます。 could mean:

• I live in an apartment
• He lives in an apartment
• She lives in an apartment
• They live in an apartment

The listener figures it out from the situation.

If you want to make it explicit, you can add the subject:

• 私はアパートに住んでいます。 = I live in an apartment.
• 彼はアパートに住んでいます。 = He lives in an apartment.
• 田中さんはアパートに住んでいます。 = Mr./Ms. Tanaka lives in an apartment.

A natural pronunciation guide is:

• すんでいます
• roughly: soon-deh ee-mass

A few notes:

• 住 is read す
• んで sounds like nde
• います is polite います
• In natural speech, て in でいます can sound a little light, and います may sound closer to imasu with a soft final u

So the full sentence is:

• アパートにすんでいます。

It can be either. The sentence itself just says that living in an apartment is your current situation.

So アパートに住んでいます。 could mean:

• I currently live in an apartment.
• I have been living in an apartment for some time.
• My home is an apartment.

It does not by itself say whether this is permanent, temporary, recent, or long-term. You would need extra words for that, such as:

• 今はアパートに住んでいます。 = Right now, I live in an apartment.
• ずっとアパートに住んでいます。 = I’ve been living in an apartment for a long time.