این خیابان امروز کثیف است، اما خیابان نزدیک خانه ما تمیز است.

A very natural way to read it is in two parts:

• این خیابان امروز کثیف است
• اما خیابان نزدیک خانه ما تمیز است

The basic Persian pattern here is:

• topic / subject
• time expression if needed
• description
• است at the end

So Persian often feels like:

• this street today dirty is
• but the street near our house clean is

That final است is the normal Persian copula, meaning is.

Because Persian usually puts the verb, including است, at or near the end of the clause.

So:

• کثیف است = is dirty
• تمیز است = is clean

This is one of the most important word-order differences from English. English says the street is dirty; Persian typically says the street dirty is.

این means this and comes before the noun:

• این خیابان = this street

That is the normal position for demonstratives in Persian. Similarly:

• آن خیابان = that street

So if you are thinking in English order, this part is actually quite familiar: this + noun.

Persian does not use articles the same way English does.

• There is no direct everyday equivalent of English the in most cases.
• Indefiniteness can be shown with یک for a / one, but it is not always required.

So:

• این خیابان is automatically definite because this already identifies it.
• خیابان نزدیک خانه ما is understood as a specific street from context.

If you wanted a street, you could say یک خیابان.

Yes, امروز means today, and time words in Persian are fairly flexible.

In this sentence, امروز sits after این خیابان, which is very natural:

• این خیابان امروز کثیف است

But Persian could also say:

• امروز این خیابان کثیف است

Both are fine. The exact position can slightly affect emphasis, but both mean essentially the same thing here. The most important thing is that است still stays at the end.

Because کثیف here is not an adjective directly attached to the noun inside a noun phrase. It is the predicate of the sentence.

So this sentence means:

• The street is dirty

not

• the dirty street

In Persian:

• خیابان کثیف است = the street is dirty
• خیابانِ کثیف = the dirty street

That little -e sound, called ezafe, is used when an adjective directly modifies a noun inside a noun phrase. But here کثیف is part of the statement about the street, so no ezafe is needed there.

The same applies to تمیز است.

This is a great question, because Persian writing often hides some grammar that you still pronounce.

A fuller pronunciation is:

• خیابانِ نزدیکِ خانهٔ ما

In normal Persian spelling, the ezafe is often not written after consonants, so learners have to supply it mentally.

So the structure is:

• خیابانِ = street
• نزدیکِ = near / close to
• خانهٔ ما = our house

Together: the street near our house

So even though the written sentence shows خیابان نزدیک خانه ما, a learner should know that the linking sounds are there in pronunciation.

Because Persian possessive structure is different from English.

English says:

• our house

Persian often says:

• خانهٔ ما
• literally: house of us

So the possessor comes after the noun.

There is also a shorter attached form:

• خانه‌مان = our house

So these are both possible:

• خانهٔ ما
• خانه‌مان

The version in your sentence uses the separate pronoun ما.

No. Persian adjectives do not agree with nouns the way adjectives do in some other languages.

That means they do not change for:

• gender
• number
• definiteness

So کثیف stays کثیف, and تمیز stays تمیز, no matter what noun they describe.

This is good news for learners: Persian adjective forms are usually much simpler than in many European languages.

Yes. اما means but and is completely correct here.

However, in everyday speech, many speakers also use:

• ولی

So these are both possible:

• اما
• ولی

اما can sound a little more neutral or slightly more formal/written than ولی, but both are common and natural.

In everyday speech, two common changes happen:

• است often becomes -ه
• some words have more colloquial pronunciations

So a spoken version might sound like:

• این خیابون امروز کثیفه، اما خیابون نزدیکِ خونهٔ ما تمیزه

Compared with the written form:

• خیابان → خیابون
• است → -ه

This does not change the meaning; it just makes the sentence sound more conversational.