شارعنا ليس هادئا في المساء، لكن البيت هادئ بعد أن نغلق النوافذ.

Our street is not quiet in the evening, but the house is quiet after we close the windows.

Breakdown of شارعنا ليس هادئا في المساء، لكن البيت هادئ بعد أن نغلق النوافذ.

• بيت: house
• في: in
• لكن: but
• أن: (subordinating particle)

Questions & Answers about شارعنا ليس هادئا في المساء، لكن البيت هادئ بعد أن نغلق النوافذ.

Why is شارعنا written as one word, and why is there no الـ?

شارعنا is made of:

• شارع = street
• ـنا = our

In Arabic, possessive pronouns attach directly to the noun, so it becomes one word.

Also, a noun with a possessive suffix is already definite, so you do not add الـ.

Compare:

• شارع = a street / street
• الشارع = the street
• شارعنا = our street

So الشارعنا would be incorrect.

Why is هادئ not written as الهادئ?

Because here هادئ is the predicate of the sentence, not an attributive adjective.

• البيت هادئ = the house is quiet
• البيت الهادئ = the quiet house

That is an important difference in Arabic:

• noun + indefinite adjective/predicate often means X is Y
• noun + matching definite adjective means the Y noun

So in this sentence, هادئ / هادئًا means quiet as the description being asserted, not the quiet as part of a noun phrase.

Why is ليس used here instead of لا?