تو کی به ایستگاه خواهی رفت؟

Yes. In Persian, subject pronouns are often omitted because the verb already shows the person.

• خواهی رفت already means you will go
• So کی به ایستگاه خواهی رفت؟ is also correct

Including تو makes the subject more explicit. It can sound:

• slightly more emphatic
• more contrastive, like when will you go?
• or simply clearer for the learner / listener

Also, تو is informal singular you.

تو is informal singular you.

If you want to be polite, or if you are talking to more than one person, use شما:

شما کی به ایستگاه خواهید رفت؟

So:

• تو = informal singular
• شما = polite singular or plural

Here, کی means when.

In colloquial Persian, کی can also mean who, so learners often notice that it looks ambiguous. In this sentence, the meaning is clearly when, because تو is already the subject.

Common time-question alternatives are:

• کی = when? very common in speech
• چه وقت = when? a bit more explicit
• چه زمانی = when? more formal

So you could also say:

تو چه وقت به ایستگاه خواهی رفت؟

به means to in this sentence. It marks direction or destination.

So:

• به ایستگاه = to the station

This is very common with verbs of motion, such as:

• رفتن = to go
• آمدن = to come

In very colloquial speech, Persian sometimes drops به in certain expressions, but with a learner sentence like this, keeping به is the safest and most standard choice.

ایستگاه means station or stop, depending on context.

It does not automatically mean only train station. It can refer to:

• a train station
• a bus stop or station
• a metro station
• another kind of station

If Persian speakers want to be more specific, they may add another word, such as:

• ایستگاه قطار = train station
• ایستگاه مترو = metro station
• ایستگاه اتوبوس = bus stop

So ایستگاه by itself is somewhat general.

خواهی رفت is the future tense.

It is formed with:

• a conjugated form of خواستن used as an auxiliary
• plus the past stem of the main verb

Here:

• خواهی = you will
• رفت = the past stem of رفتن, to go

So:

• خواهی رفت = you will go

The full pattern for رفتن in the future is:

• خواهم رفت = I will go
• خواهی رفت = you will go
• خواهد رفت = he/she will go
• خواهیم رفت = we will go
• خواهید رفت = you will go
• خواهند رفت = they will go

Because the Persian future construction specifically uses the past stem of the main verb.

For رفتن:

• infinitive = رفتن
• past stem = رفت
• present stem = رو

Different tenses use different stems:

• می‌روی = you go / you are going
  
  • this uses the present stem رو
• خواهی رفت = you will go
  
  • this uses the auxiliary خواهی
    • past stem رفت

So even though it may feel unusual to an English speaker, رفت is exactly what Persian grammar expects here.

Yes. It comes from خواستن.

As a normal main verb, خواستن means to want. But in the future tense, forms like خواهم / خواهی / خواهد act as auxiliaries, similar to will in English.

So in this sentence:

• خواهی رفت does not mean you want to go
• it means you will go

This is one of those cases where a verb develops an auxiliary function.

It is grammatically correct, but in everyday conversation many speakers would more often use the present tense to talk about a future event.

A very common spoken version would be:

کی به ایستگاه می‌ری؟

This literally looks like when are you going to the station?, but in context it often means when will you go to the station?

So:

• تو کی به ایستگاه خواهی رفت؟ = correct, more formal/bookish
• کی به ایستگاه می‌ری؟ = very natural in speech

Because Persian is usually an SOV language:

• Subject
• Object or other complements
• Verb

So Persian verbs often come at the end of the clause.

In this sentence:

• تو = subject
• کی = question word
• به ایستگاه = destination phrase
• خواهی رفت = verb

That final verb position is very normal in Persian.

Persian word order is fairly flexible, especially with question words, as long as the sentence remains clear.

These are all possible, with slightly different emphasis:

• تو کی به ایستگاه خواهی رفت؟
• کی به ایستگاه خواهی رفت؟
• تو به ایستگاه کی خواهی رفت؟

The first version is very straightforward and natural for a learner. The verb usually stays at the end, but the position of تو, کی, and به ایستگاه can shift for emphasis.

Add نـ to the future auxiliary:

• خواهی رفت = you will go
• نخواهی رفت = you will not go

So the full sentence becomes:

تو کی به ایستگاه نخواهی رفت؟

That means When will you not go to the station?

A simple learner-friendly pronunciation is:

to key be istgâh khâhi raft?

A few notes:

• تو = to
• کی = key
• به = be
• ایستگاه ≈ istgâh
• خواهی ≈ khâhi
• رفت = raft

In careful speech, the written sentence is clear and correct, but remember that everyday spoken Persian often prefers a different form such as می‌ری instead of خواهی رفت.