शनिवार को मैं बिज़ी हूँ।

शनिवार means Saturday.

A common pronunciation guide is sha-ni-vaar:

• श = sh
• नि = ni
• वार = roughly vaar

So you can say it approximately like shun-ih-vaar. The vaar part is a bit longer than a short English var.

In this sentence, को marks the time expression on Saturday.

So:

• शनिवार = Saturday
• शनिवार को = on Saturday

With days of the week, को is very commonly used when talking about something happening on that day.

Yes, depending on context, शनिवार को can mean:

• on Saturday
• this Saturday

Hindi often leaves this kind of detail to context. If the situation already makes it clear which Saturday you mean, शनिवार को is enough.

Yes, मैं can be omitted if the context already makes the subject clear.

So both of these can work:

• शनिवार को मैं बिज़ी हूँ।
• शनिवार को बिज़ी हूँ।

However, including मैं is very normal and helpful, especially for learners or when you want to be clear: I am busy on Saturday.

Yes, बिज़ी is borrowed from English busy, and this is very common in modern Hindi.

Many speakers naturally mix Hindi with English, especially in everyday speech. So:

• बिज़ी sounds natural in conversation
• A more traditionally Hindi word would be व्यस्त

So you may hear both:

• मैं बिज़ी हूँ।
• मैं व्यस्त हूँ।

The first is usually more common in casual speech.

हूँ is the I am form of the verb to be.

So:

• मैं ... हूँ = I am ...

In this sentence:

• मैं बिज़ी हूँ = I am busy

This form हूँ is specifically used with मैं.

हूँ is pronounced roughly like hoon, but with nasalization.

A simple learner-friendly approximation is:

• hoon

More exactly:

• the vowel is nasalized, so it is not exactly plain hoon
• the nasal sound is shown by ँ

You do not need to overdo it at first. Saying something close to hoon is usually understandable.

No, Hindi word order is somewhat flexible.

These are all natural:

• शनिवार को मैं बिज़ी हूँ।
• मैं शनिवार को बिज़ी हूँ।

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

• शनिवार को मैं बिज़ी हूँ puts on Saturday first
• मैं शनिवार को बिज़ी हूँ starts with I

Both are correct.

In Hindi, the main descriptive word usually comes before the form of to be.

So:

• मैं बिज़ी हूँ = literally something like I busy am

This is normal Hindi sentence structure. English says I am busy, but Hindi typically puts the description before the verb.

Sometimes you may hear day words without को, especially in casual speech or in certain contexts, but शनिवार को is the safest and most standard choice here.

For a learner, it is best to use:

• शनिवार को मैं बिज़ी हूँ।

That clearly and naturally means I am busy on Saturday.

You add नहीं before हूँ:

• शनिवार को मैं बिज़ी नहीं हूँ।

That means:

• I am not busy on Saturday.

A very common pattern is:

• मैं ... नहीं हूँ = I am not ...

It is neutral and natural in everyday Hindi.

Because it uses बिज़ी, it sounds modern and conversational. It is perfectly fine in normal speech. In a more formal style, someone might prefer:

• शनिवार को मैं व्यस्त हूँ।

But शनिवार को मैं बिज़ी हूँ। is very common and natural in real life.