kore ha sodaigomi desu.

When は is used as the topic particle, it is pronounced wa. This is one of the most common spelling/pronunciation mismatches in Japanese.

So in:

これは粗大ごみです。

the は is not being read as the normal syllable ha. It marks the topic, so it is pronounced wa.

This is also true in sentences like:

• 私は学生です。 → watashi wa gakusei desu
• 今日は暑いです。 → kyou wa atsui desu

これ means this and refers to something near the speaker.

It is a standalone pronoun, so it can function like an entire noun phrase by itself. In English, this can also stand alone, and Japanese works similarly here.

Compare:

• これ = this
• それ = that (near the listener)
• あれ = that over there (away from both)

So これ is the thing being identified as 粗大ごみ.

は marks the topic of the sentence.

In これは粗大ごみです。, the topic is これ. The sentence is basically saying:

• As for this, it is bulky garbage.

That sounds a little unnatural in English, but it shows the grammar well.

A useful way to think about は:

• It introduces what the sentence is about.
• It does not always mean the grammatical subject in the English sense.
• It often creates a contrast or frames the topic for comment.

In this sentence, the comment about これ is 粗大ごみです.

粗大ごみ is a noun meaning bulky garbage / oversized trash.

It is made of:

• 粗大 = bulky, large-sized
• ごみ = garbage, trash

In Japan, 粗大ごみ usually refers to large items that cannot be thrown away with ordinary household trash, such as:

• furniture
• large appliances
• mattresses
• bicycles

So this word is not just any trash; it refers to a specific disposal category.

That is very common in Japanese.

The word ごみ can be written as:

• ごみ
• ゴミ
• sometimes 塵 or other kanji forms, though these are much less common in everyday writing

In practical Japanese, ごみ is often written in hiragana because it is easy to read and very standard. So 粗大ごみ is a normal mixed-script spelling.

You may also see:

• 粗大ゴミ

That is also common, especially in signs, notices, or administrative writing.

So this is not unusual at all—Japanese often mixes kanji and kana in natural ways.

Because 粗大ごみ is the predicate noun, followed by です.

The structure is:

• これ = topic
• は = topic marker
• 粗大ごみ = noun being asserted about the topic
• です = polite copula

So the sentence pattern is:

A は B です

This is a very basic Japanese pattern, often corresponding to:

• A is B

You do not put particles like を or が between B and です in this kind of sentence.

です is the polite copula. In sentences like this, it plays a role similar to is / am / are in English, though it does not work exactly the same way in every context.

In:

これは粗大ごみです。

です makes the sentence:

• polite
• complete
• formal enough for everyday neutral speech

Without going too deep, you can think of the pattern as:

• これは粗大ごみです。 = polite
• これは粗大ごみだ。 = plain/casual

So です is what gives the sentence its polite tone.

Yes. A casual/plain version would be:

これは粗大ごみだ。

Or in very casual speech, people may even say:

これ、粗大ごみ。

That last version is less complete grammatically, but very natural in conversation if the context is clear.

So the levels are roughly:

• これは粗大ごみです。 = polite
• これは粗大ごみだ。 = plain
• これ、粗大ごみ。 = very casual/conversational

Grammatically, it is これ + は:

• これ = this
• は = topic particle

In writing, Japanese is normally written without spaces, so you will usually see:

これは粗大ごみです。

not

これ は 粗大ごみ です。

Learning materials often add spaces to help beginners see the parts, but in normal Japanese text there are usually no spaces.

These are part of the ko-so-a-do system:

• これ = this (near me)
• それ = that (near you / what you just mentioned)
• あれ = that over there (far from both of us)

So depending on where the object is, you could get:

• これは粗大ごみです。 = This is bulky garbage.
• それは粗大ごみです。 = That is bulky garbage.
• あれは粗大ごみです。 = That over there is bulky garbage.

English often just says this or that, but Japanese makes the distance relationship more explicit.

Usually, は is the natural choice in a simple statement like this.

• これは粗大ごみです。 sounds like a neutral statement: As for this, it is bulky garbage.

If you used が, the nuance would change. これが粗大ごみです can sound more like:

• This is the bulky garbage
• This is what counts as bulky garbage
• an identifying or contrastive statement

So:

• は = topic, general statement
• が = stronger focus on the item itself, often in identification or contrast

Both can be grammatical, but they do not feel exactly the same.

Japanese does not have articles like a, an, or the.

That means 粗大ごみ does not need anything before it to show definiteness. Whether English would use a, the, or no article at all depends on context and translation.

Japanese often leaves that kind of information to context instead of marking it with separate words.

This is very normal, and learners gradually get used to not expecting articles in Japanese sentences.

Yes. 粗大ごみ and 粗大ゴミ are both commonly seen.

The difference is mostly a matter of writing style, readability, and convention. For everyday purposes, both are acceptable. You may notice:

• hiragana versions in simpler or more learner-friendly writing
• katakana versions on signs, forms, labels, or official notices

So if you see 粗大ゴミです, that is not a different word—just a different spelling choice.