अगर ट्रेन देर से आएगी, तो हम स्टेशन पर इंतज़ार करेंगे।

अगर ... तो is the standard if ... then pattern in Hindi.

• अगर = if
• तो = then

So:

• अगर ट्रेन देर से आएगी = if the train arrives late
• तो हम स्टेशन पर इंतज़ार करेंगे = then we will wait at the station

A very important note: तो is often optional in everyday Hindi.
So this sentence could also be:

अगर ट्रेन देर से आएगी, हम स्टेशन पर इंतज़ार करेंगे।

That still sounds natural.

आएगी is the future tense form of आना (to come / to arrive) that agrees with a feminine singular subject.

Here, the subject is ट्रेन, and ट्रेन is treated as feminine in Hindi.

So:

• ट्रेन आएगी = the train will come
• बस आएगी = the bus will come
• लड़का आएगा = the boy will come

The ending tells you about agreement:

• -एगा / -गा → masculine singular
• -एगी / -गी → feminine singular
• -एंगे / -ेंगे → plural / respectful / we

So आएगी is used because ट्रेन is feminine singular.

In Hindi, every noun has grammatical gender, including many borrowed words. ट्रेन is normally treated as feminine.

That is why you get:

• ट्रेन आई
• ट्रेन देर से आई
• ट्रेन आएगी

This is something learners usually just have to memorize along with the noun.

देर means delay / lateness / late, and देर से means late or after a delay.

In Hindi, से has many uses, and one common expression is:

• देर से आना = to come late
• देर से पहुँचना = to arrive late

So in this sentence:

• ट्रेन देर से आएगी = the train will arrive late

You do not need to translate से word-for-word here. It is part of the natural Hindi expression.

Because इंतज़ार is used with करना to form the verb to wait.

• इंतज़ार = waiting / expectation
• इंतज़ार करना = to wait

So:

• मैं इंतज़ार करूँगा = I will wait
• हम इंतज़ार करेंगे = we will wait

This is a very common Hindi pattern: a noun combines with करना to make a verb.

Examples:

• फ़ैसला करना = to decide
• कोशिश करना = to try
• सफ़र करना = to travel

करेंगे is the future form that agrees with हम (we).

So:

• मैं करूँगा / करूँगी = I will do
• हम करेंगे = we will do
• वे करेंगे = they will do

In this sentence:

• हम स्टेशन पर इंतज़ार करेंगे = we will wait at the station

The verb agrees with the subject हम.

पर is a postposition that often means on, at, or upon, depending on context.

Here:

• स्टेशन पर = at the station

Hindi uses postpositions after the noun, unlike English prepositions before the noun.

So compare:

• English: at the station
• Hindi: स्टेशन पर

Other examples:

• मेज़ पर = on the table
• घर पर = at home
• कुर्सी पर = on the chair

Hindi normally follows Subject–Object–Verb word order, and the main verb usually comes at the end of its clause.

So:

• ट्रेन देर से आएगी
• हम स्टेशन पर इंतज़ार करेंगे

This is very normal Hindi structure.

A native English speaker may expect something like we will wait at the station, where the verb comes earlier. In Hindi, it is more natural for करेंगे to come at the end.

Yes, it can.

The sentence as given is:

अगर ट्रेन देर से आएगी, तो हम स्टेशन पर इंतज़ार करेंगे।

You can also put the main clause first, though the original order is especially common when setting up a condition clearly.

For example:

हम स्टेशन पर इंतज़ार करेंगे अगर ट्रेन देर से आएगी।

This is understandable, but the version with the अगर clause first is usually smoother and more standard in teaching materials.

No, तो is very common but not always required.

You can say:

• अगर ट्रेन देर से आएगी, तो हम स्टेशन पर इंतज़ार करेंगे।
• अगर ट्रेन देर से आएगी, हम स्टेशन पर इंतज़ार करेंगे।

Both are correct.

Using तो often makes the if/then relationship feel clearer or more explicit.

Not if you want the same meaning.

This sentence talks about a future possibility, so Hindi naturally uses the future in both clauses:

• आएगी = will come
• करेंगे = will do / will wait

So:

अगर ट्रेन देर से आएगी, तो हम स्टेशन पर इंतज़ार करेंगे।

If you changed the tense, the meaning would also change.

For example:

• अगर ट्रेन देर से आती है... can sound more like a general/habitual condition: if the train comes late or if the train tends to come late

That is a different nuance from this specific future situation.

Yes. It comes from आना in the future tense and is pronounced roughly like:

aa-eh-gi

The spelling is:

• आ + ए + गी → आएगी

Learners sometimes find this form visually tricky because of the vowel sequence. It is a completely normal future form.

Related forms:

• आएगा = he/it (masculine) will come
• आएगी = she/it (feminine) will come
• आएंगे = they/we will come

Hindi does not normally use articles like a, an, or the.

So:

• ट्रेन can mean a train or the train
• स्टेशन can mean a station or the station

The exact meaning depends on context.

In this sentence, English naturally uses the train and the station, but Hindi does not need separate words for that.

Sometimes yes, but the meaning is slightly different.

• इंतज़ार करेंगे = we will wait
• रुकेंगे = we will stop / stay / remain

If the idea is specifically wait for the train, इंतज़ार करेंगे is more precise.

If you say:

• हम स्टेशन पर रुकेंगे = we will stay/remain at the station

That may imply staying there, but not necessarily waiting in the same explicit sense.

So in this sentence, इंतज़ार करेंगे is the better choice.

Yes, and that is actually very common when you say what you are waiting for.

• हम इंतज़ार करेंगे = we will wait
• हम ट्रेन का इंतज़ार करेंगे = we will wait for the train

In your sentence, the object is already understood from context, so it can be left out.

A fuller version would be:

अगर ट्रेन देर se आएगी, तो हम स्टेशन पर ट्रेन का इंतज़ार करेंगे।

That is grammatical, though a little more repetitive because ट्रेन has already been mentioned.