kyuuzitu ha nani mo sinaide ie de yukkuri simasu.

は marks 休日 as the topic of the sentence.

So 休日は means something like:

• As for holidays...
• On days off...

It does not mean subject in exactly the same way English does. It sets the scene for what the speaker is about to say.

So the sentence starts by telling you: speaking about days off, this is what happens.

Yes, the subject is omitted, which is very common in Japanese.

A natural English translation uses I, because that is what the context usually implies:

• On my days off, I do nothing and relax at home.

Japanese often leaves out I, you, he, she, etc. if they are already understood from context.

So even though the sentence does not explicitly say 私は, it is very natural to understand it as I unless the larger context suggests someone else.

In a negative sentence, 何も ～ ない is a very common pattern meaning not anything or nothing.

So:

• 何も しない = do nothing
• literally, not do anything

Here, も adds the sense of even or at all, but in practice you should learn 何も～ない as a set pattern.

Important point:

• 何も by itself does not automatically mean nothing
• it gets that meaning when used with a negative verb

So in this sentence:

• 何もしないで = without doing anything / doing nothing and...

しないで is the negative て-form of する.

Here it means:

• without doing
• not doing ... and then ...
• instead of doing ...

So:

• 何もしないで 家で ゆっくりします = I relax at home without doing anything = I do nothing and just take it easy at home

In this sentence, しないで connects doing nothing with the main action ゆっくりします.

Both forms exist, but they are not always interchangeable.

In this sentence, しないで is the more natural choice because it means:

• without doing anything
• not doing anything, and then relaxing

By contrast, しなくて often has a different feel, and can suggest:

• a reason or cause
• because I don't do anything...
• or simply a different kind of connection

So for the idea I relax at home without doing anything, しないで fits better.

Because で marks the place where an action happens.

Here, the action is:

• ゆっくりします = relax / take it easy

That action happens at home, so Japanese uses で:

• 家で = at home

By contrast, に is often used for:

• destination
• existence
• specific point in time
• a target of movement

For example:

• 家に帰る = go home
• 家にいる = be at home

But:

• 家で休む
• 家で勉強する
• 家でゆっくりする

all use で, because they describe actions taking place there.

Here, ゆっくりします means:

• relax
• take it easy
• spend time leisurely

ゆっくり is often taught as an adverb meaning slowly, but it also has the nuance of taking it easy or in a relaxed way.

So in this sentence, it is not really about moving slowly. It is about spending time in a relaxed way.

That is why a natural translation is:

• I just relax at home
• I take it easy at home

Because Japanese often uses する with adverb-like or noun-like expressions to mean to spend time in that way or to be in that state.

So:

• ゆっくりする = relax, take it easy

This is a very common expression, and you should learn it as a set phrase.

Other similar expressions exist in Japanese, where する helps turn an expression into something like a verb.

So although it may feel strange if you try to translate word by word, ゆっくりする is completely natural Japanese.

This is normal.

The sentence ends in polite form:

• します

But inside the sentence, before で, the verb appears in a connecting form:

• しないで

This does not make the whole sentence casual. Japanese often mixes a plain connecting form with a polite final verb.

So this is perfectly natural:

• 何もしないで、家でゆっくりします。

The politeness of the whole sentence is mainly shown by the final verb.

Japanese word order is more flexible than English, but not completely free.

This sentence is arranged in a very natural order:

• 休日は = topic
• 何もしないで = without doing anything
• 家で = at home
• ゆっくりします = relax

That said, some parts can be moved for emphasis. For example:

• 休日は家で何もしないでゆっくりします。

This is also natural.

What usually stays true is that the main verb comes near the end.

So the exact order can vary a bit, but the original sentence is a very standard and easy-to-understand version.

Both can relate to time off, but they are not exactly the same in nuance.

• 休日 often sounds a bit more formal and means holiday, day off, or non-working day
• 休み is more everyday and can mean rest, break, or day off

In many casual situations, people might say:

• 休みの日は、何もしないで家でゆっくりします。

That sounds very natural too.

So 休日 is not wrong at all, but it may sound slightly more formal or written than 休み.

In normal Japanese writing, there are usually no spaces between words.

So it would normally be written like this:

休日は何もしないで家でゆっくりします。

The spaced version is usually just for learners, to make the structure easier to see.

A comma could also be added if the writer wants a pause:

休日は、何もしないで家でゆっくりします。

But the spaces themselves are not part of standard Japanese writing.