Этот дом огромный.

In Russian, the verb to be is usually omitted in the present tense.

So English This house is huge becomes simply:

Этот дом огромный.

There is no present-tense есть here. Using есть in this kind of sentence would usually sound wrong or unnatural.

Compare:

• Этот дом огромный. = This house is huge.
• Этот дом был огромный. = This house was huge.
• Этот дом будет огромный. = This house will be huge.

So in the present tense, Russian normally just leaves is out.

Because этот has to agree with дом.

Russian demonstratives like this change form depending on the gender, number, and case of the noun they describe.

дом is:

• masculine
• singular
• nominative

So the correct form is этот.

Some basic forms are:

• этот дом = this house/home/building (masculine)
• эта книга = this book (feminine)
• это окно = this window (neuter)
• эти дома = these houses (plural)

English this does not change, but Russian does.

Because adjectives in Russian must agree with the noun they describe.

Here, дом is:

• masculine
• singular
• nominative

So the adjective also has to be:

• masculine
• singular
• nominative

That gives огромный.

Compare:

• огромный дом = a huge house/home/building
• огромная комната = a huge room
• огромное окно = a huge window
• огромные дома = huge houses

The ending changes to match the noun.

A very common rule in Russian is:

• nouns ending in a consonant are usually masculine
• nouns ending in -а / -я are often feminine
• nouns ending in -о / -е are often neuter

Since дом ends in a consonant, it is masculine.

That is why you get:

• этот дом
• огромный дом

Both words use masculine forms to match дом.

It is in the nominative case.

Why? Because дом is the subject of the sentence: it is the thing being described.

In Этот дом огромный, the structure is basically:

• Этот дом = the subject
• огромный = what is being said about the subject

So nominative is the natural case here.

Yes, огромен is possible, but it is a different form and style.

Russian has:

• long-form adjectives: огромный
• short-form adjectives: огромен

So you may see:

• Этот дом огромный.
• Этот дом огромен.

Both mean roughly the same thing, but there is a nuance:

• огромный sounds more neutral and common in everyday speech
• огромен can sound more literary, formal, or emphatic

For a learner, Этот дом огромный is the safer and more common pattern to use.

This is a very important difference.

• Этот дом огромный.
  = This house is huge.
  Here, огромный is part of the predicate: it tells you something about the house.

• Этот огромный дом
  = this huge house
  Here, огромный directly modifies дом inside the noun phrase.

So:

• Этот дом огромный. = full sentence
• Этот огромный дом = noun phrase, not a complete sentence by itself

English makes this distinction too:

• This house is huge.
• This huge house.

Yes, Russian word order is flexible, but the emphasis changes.

The most neutral order here is:

• Этот дом огромный.

You could also hear:

• Дом огромный. = The house is huge.
• Огромный этот дом. = More emotional or emphatic, like This house is huge!
• Этот огромный дом = not the same structure; that means this huge house

So yes, word order can change, but it is not always just a free swap. Sometimes the meaning or sentence structure changes too.

It is like this, not like the.

Russian has no articles like English a/an/the.

So:

• дом can mean a house, the house, or just house/home, depending on context
• этот дом specifically means this house

So этот adds the idea of pointing something out: this one.

The stress is:

• Э́тот дом огро́мный.

A simple pronunciation guide:

• этот ≈ EH-tuht
• дом ≈ dohm
• огромный ≈ a-GROM-nyy

A few helpful notes:

• The stress in этот is on the first syllable: Э́тот
• The stress in огромный is on the second syllable: огро́мный
• Unstressed о is reduced in pronunciation, so it may sound closer to a than a clear English o

Yes.

• Этот дом огромный. = This house is huge.
• Дом огромный. = The house is huge / This house is huge / The house is big, depending on context

Russian often leaves out words that English would include if the context is already clear.

Using этот makes it more specific and more like pointing: this house.

Because in this sentence the adjective is not directly attached to the noun inside a noun phrase. It is part of the predicate.

Compare:

• огромный дом = a huge house
  adjective before noun, because it directly modifies the noun

• Дом огромный. = The house is huge.
  adjective after noun, because it is the predicate

So the position reflects the structure:

• before the noun = describing it inside a phrase
• after the noun = saying something about it in a full sentence

Not always.

дом can mean:

• house
• home
• sometimes building, depending on context

In this sentence, the exact English translation depends on the context you were given. Grammatically, though, the Russian sentence stays the same.

That is very normal in Russian: one word can cover several English words, and context tells you which one is meant.