अगर तुम देर से आओगी, तो मैं स्टेशन पर इंतज़ार करूँगी।

Because these are future-tense forms used for a feminine singular subject.

• आओगी = you will come (said to one female person, with तुम)
• करूँगी = I will do / I will (said by a female speaker)

In Hindi, future forms often show gender and number.
For feminine singular, -गी is very common.

So in this sentence:

• तुम ... आओगी tells us the person being addressed is female.
• मैं ... करूँगी tells us the speaker is also female.

If the speaker were male, he would say करूँगा instead of करूँगी.

No, तुम itself does not show gender. It simply means you.

The gender is shown by the verb form, not by तुम.

So:

• तुम आओगे = you will come (to a male or mixed group, depending on context)
• तुम आओगी = you will come (to a female)

This is very common in Hindi: pronouns often stay the same, while the verb changes to match gender and number.

Only the verb referring to I would change.

A male speaker would say:

अगर तुम देर से आओगी, तो मैं स्टेशन par इंतज़ार करूँगा।

So:

• करूँगी = I will wait (female speaker)
• करूँगा = I will wait (male speaker)

If the person being addressed were male too, then that part would also change:

अगर तुम देर से आओगे, तो मैं स्टेशन पर इंतज़ार करूँगा / करूँगी।

अगर ... तो works like if ... then.

• अगर = if
• तो = then

So the structure is:

• अगर
  • condition
• तो
  • result

In this sentence:

• अगर तुम देर से आओगी = if you come late
• तो मैं स्टेशन पर इंतज़ार करूँगी = then I will wait at the station

In natural Hindi, तो is often used to clearly mark the second part, but sometimes speakers omit it in casual speech if the meaning is obvious.

Yes. Hindi usually follows Subject-Object-Verb order, and the main verb often comes at the end of its clause.

The sentence breaks down like this:

• अगर = if
• तुम = you
• देर से = late
• आओगी = will come

Then:

• तो = then
• मैं = I
• स्टेशन पर = at the station
• इंतज़ार = waiting
• करूँगी = will do / will wait

So literally it is closer to:

If you late come, then I station at waiting will do.

That sounds strange in English, but it is normal in Hindi.

In देर से, the postposition से helps form an adverbial expression meaning late or after some delay.

So:

• देर = delay / lateness
• देर से आना = to come late

This is a fixed and very common expression.

Examples:

• वह देर से आया। = He came late.
• तुम देर से क्यों आई? = Why did you come late?

Here, से does not literally mean from in the English sense. In this phrase, it is just part of how Hindi expresses late.

Because the subject is तुम, not वह.

Compare:

• तुम आओगी = you will come (female)
• वह आएगी = she will come

The verb stem changes differently depending on the person.

For आना in the future:

• मैं आऊँगा / आऊँगी = I will come
• तुम आओगे / आओगी = you will come
• वह आएगा / आएगी = he/she will come
• हम आएँगे / आएँगी = we will come

So आओगी is the correct future form for तुम.

Because इंतज़ार is a noun meaning waiting, and Hindi often uses a noun + करना structure to express actions.

So:

• इंतज़ार = waiting
• इंतज़ार करना = to wait

This pattern is extremely common in Hindi, especially with words of Persian, Arabic, or English origin.

Other examples:

• फ़ैसला करना = to decide
• कोशिश करना = to try
• फ़ोन करना = to phone

So इंतज़ार करूँगी literally means something like I will do waiting, but naturally it means I will wait.

पर means on / at depending on context. Here it means at.

So:

• स्टेशन पर = at the station

Hindi uses postpositions like पर, में, से, को, etc. These come after the noun, unlike English prepositions, which come before.

Examples:

• घर में = in the house
• कुर्सी पर = on the chair
• स्कूल में = in school
• स्टेशन पर = at the station

So स्टेशन पर इंतज़ार करूँगी means I will wait at the station.

Yes, and that would make it more polite or formal.

With आप, the verb changes:

अगर आप देर से आएँगी, तो मैं स्टेशन पर इंतज़ार करूँगी।

If speaking to a woman politely:

• आप ... आएँगी

If speaking to a man politely:

• आप ... आएँगे

A key point: आप usually takes verb forms that are grammatically plural/polite, even when referring to one person.

So:

• तुम आओगी = you will come (informal/familiar, female)
• आप आएँगी = you will come (polite, female)

Yes, often it can be omitted, especially in conversation:

अगर तुम देर से आओगी, मैं स्टेशन पर इंतज़ार करूँगी।

This still sounds natural and is understood easily.

However, तो is useful because it clearly marks the second clause and gives the sentence a neat if ... then structure. Learners often find it helpful to keep using तो until they get comfortable with Hindi sentence flow.

In this sentence, it is understood as a future condition:

If you come late, I will wait at the station.

Both verbs are in the future:

• आओगी = will come
• करूँगी = will wait

A habitual meaning would usually be expressed differently, often with habitual forms such as आती हो, करती हूँ, etc., depending on context.

So this sentence is specifically about a future possibility and its result.

Yes, Hindi word order is somewhat flexible, though some versions sound more natural than others.

For example, these are possible:

• अगर तुम देर से आओगी, तो मैं स्टेशन पर इंतज़ार करूँगी।
• मैं स्टेशन पर इंतज़ार करूँगी अगर तुम देर से आओगी।

The first is more standard and clearer for learners.

You can also move स्टेशन पर for emphasis in some contexts, but the most neutral order is the original one.

So Hindi is flexible, but the original sentence is a very good, natural model to learn.

The basic verb is करना = to do.

From that verb, Hindi makes different future forms:

• मैं करूँगा / करूँगी = I will do
• तुम करोगे / करोगी = you will do
• वह करेगा / करेगी = he/she will do

In इंतज़ार करूँगी, the future form करूँगी is attached to the expression इंतज़ार करना.

So the full unit is:

• इंतज़ार करना = to wait
• इंतज़ार करूँगी = I will wait

This is a good example of how Hindi builds many everyday actions with करना.