אני רוצה לקנות וילון חדש לחלון הגדול.

Yes. רוצה means want, and it agrees with the speaker.

With אני (I), the spelling is often the same in unpointed Hebrew, but the pronunciation changes:

• אני רוצה = I want
  
  • pronounced ani rotze if the speaker is male
  • pronounced ani rotza if the speaker is female

So the written sentence can be used by either a man or a woman, but it is pronounced differently.

Because after רוצה (want), Hebrew usually uses an infinitive, just like English:

• I want to buy
• אני רוצה לקנות

The word לקנות means to buy. It is the infinitive form of the verb. The ל־ at the beginning is part of the infinitive pattern here, similar to English to in to buy.

Because את is used before a definite direct object, and וילון חדש is indefinite.

Here the phrase means:

• a new curtain = not a specific curtain

So Hebrew does not use את.

Compare:

• אני רוצה לקנות וילון חדש = I want to buy a new curtain
• אני רוצה לקנות את הווילון החדש = I want to buy the new curtain

In the second sentence, the curtain is specific, so את is required.

Because in Hebrew, adjectives usually come after the noun they describe.

So:

• וילון חדש = a new curtain
• literally: curtain new

This is normal Hebrew word order. English usually puts adjectives before the noun, but Hebrew usually puts them after.

They are masculine because they agree with the nouns they describe:

• וילון = curtain → masculine
• חלון = window → masculine

So the adjectives must also be masculine:

• וילון חדש = masculine noun + masculine adjective
• החלון הגדול = masculine noun + masculine adjective

If the nouns were feminine, the adjectives would change too.

For example:

• דלת חדשה = a new door
• הדלת הגדולה = the big door

Here לחלון means for the window.

The preposition ל־ can mean different things depending on context, including:

• to
• for

In this sentence, it does not mean movement toward the window. It means the curtain is intended for the window.

So:

• וילון חדש לחלון הגדול = a new curtain for the big window

Because short prepositions in Hebrew are usually attached directly to the following word.

So ל־ (to/for) joins the noun:

• ל + חלון = לחלון

If the noun is definite, the ה of the often gets absorbed into the preposition:

• ל + ה + חלון = לחלון
• pronounced la-chalon

So even though you do not see a separate ה before חלון, the noun is still definite here: for the window.

Because in Hebrew, if a noun is definite, its adjective must also be definite.

So:

• החלון הגדול = the big window

Both parts are definite:

• החלון = the window
• הגדול = the big

In your sentence, the noun appears after ל־, so the definiteness is built into לחלון, but the adjective still shows it clearly with הגדול.

Compare:

• לחלון גדול = for a big window
• לחלון הגדול = for the big window

Because the sentence means:

• a new curtain → any new curtain, not a specific one
• for the big window → a specific window

Hebrew can mix indefinite and definite parts just like English can.

So this sentence is perfectly natural:

• וילון חדש = a new curtain
• לחלון הגדול = for the big window

If you wanted both to be definite, you could say:

• אני רוצה לקנות את הווילון החדש לחלון הגדול
• I want to buy the new curtain for the big window

Sometimes, yes, but usually with present-tense sentences like this, keeping אני is the clearest and most natural choice.

Hebrew often drops subject pronouns in past and future because the verb form already shows the person. But in the present tense, forms are less specific, so the pronoun is often included.

So:

• אני רוצה לקנות... = very natural, clear
• רוצה לקנות... = possible in conversation, but more dependent on context

For a learner, it is usually best to keep אני.

The sentence follows a very common Hebrew pattern:

• אני = subject
• רוצה = main verb
• לקנות = infinitive
• וילון חדש = object
• לחלון הגדול = prepositional phrase

So the structure is:

Subject + want + infinitive + object + prepositional phrase

That makes the sentence very standard and natural.

A common pronunciation would be:

• Ani rotze liknot vilon chadash la-chalon ha-gadol
• or, if spoken by a woman:
• Ani rotza liknot vilon chadash la-chalon ha-gadol

A rough stress guide:

• a-NI
• rot-ZE / rot-ZA
• lik-NOT
• vi-LON
• cha-DASH
• la-cha-LON
• ha-ga-DOL

A few helpful notes:

• ח in חדש and חלון is a throaty sound, like the ch in German Bach
• וילון is pronounced vee-lon
• לחלון is pronounced la-chalon, not le-ha-chalon in normal speech