आईना बड़ा है।

Because आईना is a masculine singular noun, and बड़ा is a changing adjective that agrees with it.

In Hindi, many adjectives change like this:

• बड़ा = masculine singular
• बड़े = masculine plural
• बड़ी = feminine singular/plural in many contexts

So in आईना बड़ा है, the adjective matches आईना.

Yes. आईना is a masculine noun in Hindi.

That matters because it affects agreement:

• आईना बड़ा है = masculine singular
• If the noun were feminine, you would use बड़ी instead

For example:

• किताब बड़ी है = the book is big

So the form बड़ा helps confirm that आईना is masculine.

Hindi normally places the verb at the end. A very common basic pattern is:

noun + adjective + verb

So:

• आईना = mirror
• बड़ा = big
• है = is

That is why the sentence ends with है.

This is different from English, where is comes before the adjective: The mirror is big.

है is the present-tense form of to be for this kind of sentence. Here it means is.

So है links the subject and the description:

• आईना = subject
• बड़ा = description
• है = is

Without है, the sentence may sound incomplete in standard Hindi conversation, although in some very informal styles, headlines, poetry, or signs, it can sometimes be omitted.

Hindi usually does not use articles the way English does.

So आईना बड़ा है can mean:

• The mirror is big
• A mirror is big

In real context, the intended meaning is usually clear from the situation.

If Hindi speakers want to be more specific, they often use words like:

• यह = this
• वह = that

For example:

• यह आईना बड़ा है = this mirror is big
• वह आईना बड़ा है = that mirror is big

A good approximation is aa-ee-naa.

It has three clear parts:

• आ = aa
• ई = ee
• ना = naa

So it is pronounced roughly aa-ee-naa, not as a single English-style diphthong.

The whole sentence can be pronounced approximately like:

aa-ee-naa ba-raa hai

A more careful pronunciation of बड़ा includes a flap sound in the middle, often heard somewhat like ba-ṛaa.

These are different agreement forms of the adjective big.

• बड़ा → masculine singular
• बड़ी → feminine singular
• बड़े → masculine plural

Examples:

• आईना बड़ा है = the mirror is big
• कुर्सी बड़ी है = the chair is big
• आईने बड़े हैं = the mirrors are big

So when learning Hindi, it helps to memorize nouns together with their gender.

It would become:

आईने बड़े हैं।

Here are the changes:

• आईना → आईने = mirror → mirrors
• बड़ा → बड़े = masculine singular → masculine plural
• है → हैं = is → are

So all three parts reflect the plural.

In standard complete speech, you would normally say आईना बड़ा है.

Leaving out है can happen in:

• poetry
• headlines
• very casual note-like speech
• dramatic or stylized language

But for a learner, the safe and correct full sentence is:

आईना बड़ा है।

Yes, but it does not mean exactly the same thing in structure.

• आईना बड़ा है = The mirror is big.
  Here, big is the description of the mirror.

• बड़ा आईना है = It is a big mirror / There is a big mirror.
  Here, बड़ा is directly describing आईना as part of the noun phrase.

So both are grammatical, but they are used differently.

It is written in the Devanagari script, which Hindi uses.

The sentence is:

आईना बड़ा है।

A few useful things to notice:

• । is the Hindi full stop, called danda
• ा is the vowel sign for aa
• ी is the vowel sign for ee
• Hindi is written left to right

So even in this short sentence, you can already see how vowels may appear either as full letters or as vowel signs attached to consonants.