Cortina este închisă.

Because cortina is the definite form, meaning the curtain.

In Romanian, the definite article is usually attached to the end of the noun instead of being a separate word like the in English.

• cortină = curtain
• cortina = the curtain

So in this sentence, cortina is not just curtain but the curtain.

Here is the breakdown:

• cortina = the curtain
• este = is
• închisă = closed

So the structure is very similar to English:

• Cortina = subject
• este = verb
• închisă = adjective / past-participle form describing the subject

Because cortina is a feminine singular noun, and the word închisă has to agree with it.

Romanian adjectives often change form depending on gender and number.

Examples:

• masculine singular: închis
• feminine singular: închisă
• masculine plural: închiși
• feminine plural: închise

Since cortina is feminine singular, the correct form is închisă.

It is originally the past participle of the verb a închide = to close, but in this sentence it functions like an adjective meaning closed.

So este închisă works like is closed in English.

You will see this pattern a lot in Romanian:

• ușa este închisă = the door is closed
• fereastra este deschisă = the window is open

Yes. Very commonly.

• este is the full form
• e is the shorter, very common spoken form

So both are correct:

• Cortina este închisă.
• Cortina e închisă.

The second one sounds more natural in everyday speech.

Normally, no. In a standard sentence like this, Romanian needs the verb:

• Cortina este închisă.
• Cortina e închisă.

Leaving it out would sound incomplete in normal Romanian.

The normal, neutral word order is:

• Cortina este închisă.

This is the most natural way to say it.

Romanian does allow some flexibility, but changing the order usually adds emphasis or sounds literary, marked, or less neutral. For a learner, the standard order is the best choice.

A rough pronunciation guide is:

• închisă ≈ uhn-KEE-suh

A few useful notes:

• î is a Romanian vowel that does not exist exactly in English. It is a close central sound.
• ch before i is pronounced like k, not like ch in chair.
• ă is a short central vowel, often approximated as uh.

So închisă is not pronounced like English chin or cheese at the start.

That is just the correct spelling of the word. Romanian uses both â and î for the same basic sound, but there are spelling rules:

• î is used at the beginning and end of words
• â is usually used inside words

So:

• închisă
• începe
• urât

but:

• cuvânt
• română

Not always exactly.

cortină often refers to a stage curtain or sometimes something more formal or specialized. For an everyday household curtain, Romanian very often uses:

• perdea = curtain, sheer curtain
• draperie = drape, heavier curtain

So depending on context, an English speaker might expect curtain, but in daily home contexts Romanian may prefer a different word.

You would usually say:

• O cortină este închisă.

Here:

• o cortină = a curtain

Compare:

• cortina = the curtain
• o cortină = a curtain

Yes.

The verb este is present tense, from a fi = to be.

So the sentence means that the curtain is in a closed state now.

The dictionary form is cortină.

Romanian dictionaries usually list nouns in the indefinite singular form, not the definite one.

So if you look it up, you should search for cortină, not cortina.

Yes, very often. This is a very useful Romanian pattern:

[noun] + este/e + [adjective or participle]

For example:

• Ușa este închisă. = The door is closed.
• Geamul este închis. = The window is closed.
• Fereastra este deschisă. = The window is open.

Notice how the final word changes to agree with the noun’s gender and number.