ie ni kaettara, kooto wo nugimasu.

帰ったら means when/after (someone) returns home.

It comes from:

• 帰る = to return, to go home
• 帰った = returned
• 帰ったら = if/when/after returning

In this sentence, 〜たら is not really a strong if in the English sense. It often means when or after, especially when one action happens first and the next action follows.

So the sentence has the feel of:

• When I get home, I take off my coat
• After I get home, I take off my coat

Because 〜たら attaches to the past plain form of the verb.

So:

• 帰る → dictionary form
• 帰った → past plain form
• 帰ったら → when/if/after returning

This is just how the grammar works. Even though it uses the past form, it does not necessarily mean the whole sentence is in the past. In this pattern, the past form is simply the base used before ら.

The particle に marks the destination of 帰る.

• 家に帰る = to go home / return home

With verbs of movement, に is commonly used to show where someone goes.

So here:

• 家 = home
• 家に = to home / homeward

In natural English we just say go home, without to, but Japanese uses に here.

Yes, sometimes 家 can be read as うち, but in a sentence like this, いえ is the most straightforward reading for learners.

A simple way to think about it:

• いえ often refers to the house/home as a place
• うち can also mean home, but it can feel more personal or like my place / our place

In everyday conversation, both may appear depending on the speaker and situation. But 家に帰る with いえ is very standard.

Because ぬぎます is the main verb of the sentence, and Japanese non-past can mean:

• present
• future
• habitual action

Here it means something like:

• I will take off my coat
• I take off my coat (when I get home)

So the sentence is not describing two past actions. It is describing what happens when the speaker gets home.

Also, the first clause uses 帰ったら because of the grammar pattern, while the main action is still expressed with the polite non-past ぬぎます.

を marks the direct object of the verb.

• コートをぬぎます = take off the coat

The thing being removed is the direct object, so を is the normal particle here.

Compare:

• パンを食べます = eat bread
• 本を読みます = read a book
• コートをぬぎます = take off a coat

The dictionary form is ぬぐ.

Conjugation:

• ぬぐ = to take off
• ぬぎます = polite form
• kanji form: 脱ぐ

So this sentence could also be written as:

• 家に帰ったら、コートを脱ぎます。

Using hiragana for ぬぎます is common in learner materials, since 脱 is a less basic kanji.

Yes, they are similar, but not exactly the same.

• 帰ったら = when/after I get home
• 帰ってから = after I get home, and then...

In this sentence, both can work:

• 家に帰ったら、コートをぬぎます。
• 家に帰ってから、コートをぬぎます。

The difference is subtle:

• 〜たら often sets up a condition or timing: when that happens
• 〜てから emphasizes sequence: after doing that, then...

For beginners, both can often be translated similarly here, but 〜たら has a broader if/when feeling.

The subject is omitted, which is very common in Japanese.

Depending on context, it could mean:

• I take off my coat when I get home
• He takes off his coat when he gets home
• She takes off her coat when she gets home
• or even a general statement, depending on context

In many textbook examples, the natural assumption is I, but Japanese often leaves the subject unsaid when it is already understood.

The comma separates the first clause from the main clause:

• 家に帰ったら、 = when I get home,
• コートをぬぎます。 = I take off my coat.

It makes the sentence easier to read. Japanese commas are often used more flexibly than English commas, but here it is very natural to include one.

Because コート is a loanword, borrowed from English coat.

Katakana is commonly used for:

• foreign loanwords
• some onomatopoeia
• emphasis
• scientific names, etc.

So:

• コート = coat

This is completely normal Japanese spelling.

It could be either. The sentence by itself does not force only one interpretation.

It can mean:

• a habit: When I get home, I take off my coat
• a future action: When I get home, I’ll take off my coat

Japanese non-past forms often leave that open, and context tells you which one is meant.

Yes, it is natural.

A more fully written version with kanji would be:

• 家に帰ったら、コートを脱ぎます。

This is a normal way to say that someone takes off their coat after getting home. It is simple, clear, and grammatically standard.