آن سگ و این گربه هر روز با هم هستند.

این means this, and آن means that.

So:

• آن سگ = that dog
• این گربه = this cat

Persian uses these demonstratives before the noun, just like English.

A very common spoken equivalent of آن is اون, so in everyday speech you will often hear:

• اون سگ و این گربه...

instead of the more formal/written آن سگ و این گربه...

Persian does not have a definite article like English the.

Instead, definiteness is often understood from context, or it is made clearer with words like:

• این = this
• آن = that

So آن سگ naturally means that dog, and این گربه means this cat, without needing any separate word for the.

Because the subject is compound: that dog and this cat.

Even though dog is singular and cat is singular, together they make a plural subject, so Persian uses the plural form of to be:

• است = is
• هستند = are

So:

• آن سگ ... است = That dog is ...
• آن سگ و این گربه ... هستند = That dog and this cat are ...

با هم literally means with each other or together.

In this sentence, the natural English meaning is together.

Breakdown:

• با = with
• هم = here it helps create the idea of together / each other

So هر روز با هم هستند means they are together every day.

Important: هم can also mean also/too in other contexts, but in the fixed expression با هم, it means together.

هر روز means every day.

Breakdown:

• هر = every
• روز = day

In Persian, adverbs of time like هر روز often come before the main verb, which is exactly what happens here:

• آن سگ و این گربه هر روز با هم هستند.

That word order is very natural.

Yes. It follows a very typical Persian pattern:

subject + time expression + other phrases + verb

Here that gives:

• آن سگ و این گربه = subject
• هر روز = time expression
• با هم = together
• هستند = verb

Persian usually puts the verb at the end, unlike English.

So while English says:

• That dog and this cat are together every day

Persian naturally says something closer to:

• That dog and this cat every day together are

Because each noun is singular:

• سگ = dog
• گربه = cat

The sentence is talking about one dog and one cat. The subject becomes plural only because the two singular nouns are joined by و (and).

So the nouns stay singular, but the verb becomes plural:

• آن سگ و این گربه ... هستند

In writing, the word is و, which is often taught as va meaning and.

But in natural speech, it is very commonly pronounced more like o after a word.

So this sentence is commonly pronounced something like:

• آن سگ o این گربه...

That is completely normal.

You may see transliterations like:

• ân sag o in gorbe har ruz bâ ham hastand

In everyday spoken Persian, اون is usually more common than آن.

So a natural spoken version would often be:

• اون سگ و این گربه هر روز با هم هستن.

Compared with the more formal/written version:

• آن سگ و این گربه هر روز با هم هستند.

Both are correct, but:

• آن / هستند = more formal, standard written style
• اون / هستن = more conversational

Because demonstratives like این and آن directly modify the noun without needing ezafe.

So you say:

• این گربه = this cat
• آن سگ = that dog

not:

• اینِ گربه
• آنِ سگ

Ezafe is used in many other noun relationships, but not here.

Yes. The phrase can suggest either:

• they are together
• they are with each other

In most natural English translations of this sentence, they are together every day sounds best. But the Persian phrase does carry that idea of being in each other’s company.

Yes.

If you remove هر روز, you get:

• آن سگ و این گربه با هم هستند.
• That dog and this cat are together.

You can also move هر روز for emphasis, but the original placement is very natural. Persian allows some flexibility, though the verb usually stays at the end.

A common spoken version would be something like:

• اون سگ و این گربه هر روز با هم هستن.

A rough pronunciation guide:

• un sag o in gorbe har ruz bâ ham hastan / hastan-like

  Or, if you want to stay closer to the written form:

• ân sag o in gorbe har ruz bâ ham hastand

Main spoken differences:

• آن → اون
• هستند → هستن / هستن

Yes. Once the dog and cat are already known from context, Persian could simply say:

• آن‌ها هر روز با هم هستند.
• They are together every day.

But when the speaker wants to name both animals specifically, the full version with آن سگ و این گربه is perfectly natural.

Not by itself in this sentence.

هم often means also/too, for example:

• من هم می‌آیم = I’m coming too

But in با هم, it forms a set phrase meaning together.

So in this sentence, you should understand با هم as one unit, not as with + also.