मोज़े कुर्सी के नीचे हैं।

Because मोज़ा (sock) is a masculine noun ending in -ा, and its plural direct form changes to -े:

• singular: मोज़ा = a sock
• plural: मोज़े = socks

In this sentence, मोज़े is the thing being talked about, so the plural form मोज़े is used.

हैं is the plural form of to be in the present tense.

Since मोज़े means socks (plural), the verb is also plural:

• मोज़ा ... है = the sock is ...
• मोज़े ... हैं = the socks are ...

So हैं matches the plural noun मोज़े.

It literally means something like below the chair or under the chair.

Breakdown:

• कुर्सी = chair
• के नीचे = under / below

So:

• कुर्सी के नीचे = under the chair

In natural English, you would usually translate the whole sentence as The socks are under the chair.

In Hindi, location expressions like under, over, behind, near, etc. are often built with a noun plus a postpositional phrase:

• मेज़ के नीचे = under the table
• घर के पीछे = behind the house
• कुर्सी के पास = near the chair

So के नीचे is the normal pattern for saying under something.

This is a very common question. In expressions like के नीचे, के ऊपर, के पीछे, के पास, Hindi normally uses के as part of the fixed postpositional expression.

So you say:

• कुर्सी के नीचे
• लड़की के पास
• मेज़ के ऊपर

Even though कुर्सी is feminine, के नीचे stays the normal form here. It’s best to learn के नीचे as a unit meaning under.

Some Hindi nouns change in the oblique form before postpositions, but कुर्सी does not visibly change.

Compare:

• लड़का → लड़के के पास
• कमरा → कमरे में
• कुर्सी → कुर्सी के नीचे

Since कुर्सी is a feminine noun ending in -ी, its oblique singular looks the same as its basic form.

No. Hindi does not have articles like a, an, and the.

So मोज़े कुर्सी के नीचे हैं can mean:

• The socks are under the chair
• Socks are under the chair

Which English translation is best depends on context.

Yes, Hindi word order is somewhat flexible.

These are all possible, though they may sound slightly different in emphasis:

• मोज़े कुर्सी के नीचे हैं।
• कुर्सी के नीचे मोज़े हैं।

The first one starts with the socks, so it feels like the sentence is mainly about the socks.
The second one starts with under the chair, so it can emphasize the location a bit more.

Both are natural.

Yes. This is a location/existence sentence, not an action sentence.

It is basically:

• The socks
  • under the chair
    • are

There is no direct object here, so you do not use को.

It does both, in a way.

In this sentence, हैं works like English are in a location sentence:

• The socks are under the chair.

Hindi often uses होना (to be) for both identity and location:

• वह शिक्षक है। = He is a teacher.
• किताब मेज़ पर है। = The book is on the table.

So here हैं marks the present tense and shows that the socks are located there.

ज़ is the letter ज with a dot, and it represents a z sound in words borrowed from Persian, Arabic, or English-influenced pronunciation.

So मोज़े is pronounced roughly like mo-zay.

Many speakers may pronounce it closer to जो-type sounds in casual speech, but ज़ shows the standard z pronunciation.

Yes, मोज़ा / मोज़े is a very common everyday word.

Forms:

• मोज़ा = sock
• मोज़े = socks

So this sentence uses a very natural, common word.

Yes, depending on context.

Because Hindi has no articles, कुर्सी by itself does not tell you whether English should use:

• a chair
• the chair
• sometimes even just chair in a more general sense

In most normal situations, English would translate this as The socks are under the chair, but the exact article comes from context, not from a separate Hindi word.