मैं आज खाली हूँ।

Word by word:

• मैं = I
• आज = today
• खाली = free, empty, or not busy, depending on context
• हूँ = am

So the structure is literally I today free am.

Because Hindi usually puts the main verb or copula near the end of the sentence.

So:

• English: I am free today
• Hindi: मैं आज खाली हूँ। = I today free am

This is very normal Hindi word order. The verb होना (to be) often comes at the end.

Because हूँ matches मैं (I).

Hindi forms of to be change depending on the subject:

• मैं ... हूँ = I am
• तुम ... ho = you are
• वह ... है = he/she/it is
• हम ... हैं = we are

So मैं आज खाली हूँ। is correct, but मैं आज खाली है। is not.

In this sentence, खाली means free, not busy, or available.

It can also mean empty in other contexts. For example:

• कमरा खाली है। = The room is empty.
• मैं आज खाली हूँ। = I’m free today.

So the meaning depends on context.

Many Hindi adjectives change for gender and number, but खाली usually does not.

So both of these are normal:

• मैं आज खाली हूँ। said by a man
• मैं आज खाली हूँ। said by a woman

That is because खाली is generally treated as an indeclinable adjective in everyday use.

Yes. आज मैं खाली हूँ। is also correct.

Hindi word order is more flexible than English, especially with time words like आज.

Compare:

• मैं आज खाली हूँ।
• आज मैं खाली हूँ।

Both mean the same thing. The difference is mostly emphasis:

• मैं आज खाली हूँ। = neutral
• आज मैं खाली हूँ। = a bit more emphasis on today

A simple learner-friendly pronunciation is:

main aaj khaali hoon

A few notes:

• मैं is not exactly English main. It has a nasal sound: roughly maĩ.
• ख is an aspirated k sound, like k with a puff of air.
• हूँ is roughly hoon, also with nasalization.

A more accurate rough guide is:

maĩ aaj khaalii huũ

Sometimes native speakers do omit forms of to be in very casual conversation, especially when the meaning is obvious. But as a learner, it is much better to keep हूँ.

So say:

• मैं आज खाली हूँ।

rather than dropping it.

Keeping the full sentence sounds correct and natural, and it helps you build good grammar habits.

Just add नहीं before हूँ:

• मैं आज खाली नहीं हूँ। = I’m not free today.

This is the usual pattern:

subject + time + adjective + नहीं + form of होना

There are two common ways.

1. By intonation

   • मैं आज खाली हूँ?
   • This can work in speech, but it may sound like you are checking or repeating.

2. With क्या

   • क्या मैं आज खाली हूँ?
   • Literally: Am I free today?

If you are asking someone else, you would usually change the subject too:

• क्या तुम आज खाली हो? = Are you free today?

Yes, खाली is very common and natural for free / not busy in everyday Hindi.

But you may also hear:

• फ़्री = a very common borrowed word from English
• उपलब्ध = available, but more formal

Examples:

• मैं आज खाली हूँ। = natural everyday Hindi
• मैं आज फ़्री हूँ। = also very common in speech
• मैं आज उपलब्ध हूँ। = more formal, like in work or official situations

Not normally. In this context, people will understand खाली as free / not busy.

Even though खाली can mean empty, a sentence about a person like मैं आज खाली हूँ। is naturally understood as I’m free today.

If you wanted to talk about emotional emptiness, you would usually use different wording.

Only the form of to be changes:

• मैं आज खाली हूँ। = I am free today.
• तुम आज खाली ho. = You are free today.
• आप आज खाली हैं। = You are free today. (formal)
• वह आज खाली है। = He/She is free today.
• हम आज खाली हैं। = We are free today.

The adjective खाली stays the same.