این مدرسه بزرگ است.

this

Breakdown of این مدرسه بزرگ است.

• بزرگ: big
• بودن: to be
• مدرسه: school

Questions & Answers about این مدرسه بزرگ است.

Why does the sentence start with این and not این یک?

این means this. In Persian you usually don’t need یک (a/an/one) in simple “This is …” sentences.

• این مدرسه بزرگ است. = This school is big.
  You can add یک if you mean this is a (particular) school (emphasizing category), but it often sounds unnecessary in a basic description.

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Is این مدرسه literally “this school,” or does it mean “this is a school”?

Grammatically این مدرسه is a noun phrase: this school. Then بزرگ است is the predicate: is big.
So the structure is: [subject] + [adjective] + است.

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What part of speech is بزرگ and where does it go?

بزرگ is an adjective meaning big/large. In Persian, predicative adjectives (after a noun meaning “is big”) come after the subject:

• مدرسه بزرگ است = The school is big.
  (Unlike English, where the adjective comes after is, Persian puts بزرگ before است.)

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What is است exactly, and is it always required?