तुम कार से क्यों नहीं जाती हो?

Because the sentence is addressing a female. In Hindi, with this kind of present/habitual form, the main verb often shows gender.

• तुम ... जाती हो = said to a woman/girl
• तुम ... जाते हो = said to a man/boy, or sometimes to a mixed/masculine group

So जाती tells you the person being addressed is feminine.

से here means by or using a means of transport.

So:

• कार से = by car
• बस से = by bus
• ट्रेन से = by train

In this sentence, कार से means the person is traveling by car.

In Hindi, नहीं usually comes before the main verb or verb phrase that it negates.

So:

• क्यों नहीं जाती हो = why do you not go / why don’t you go

This placement is very normal in Hindi. English puts not differently, but Hindi commonly uses नहीं before the action word.

क्यों means why.

It asks for a reason:

• तुम कार से क्यों नहीं जाती हो? = asking the reason for not going by car

Hindi question words like क्यों, क्या, कहाँ, कब often stay in the place where the related information would naturally appear, rather than always moving to the front the way English often does.

हो is part of the verb phrase with तुम in the present/habitual style.

Here:

• जाती हो = go / do go / are accustomed to go

The हो helps complete the form for तुम.

Compare:

• मैं जाता हूँ = I go
• तुम जाते हो = you go
• वह जाता है = he goes

So हो matches तुम.

Yes, in everyday spoken Hindi, people often drop हो when the meaning is already clear.

So both are common:

• तुम कार से क्यों नहीं जाती हो?
• तुम कार से क्यों नहीं जाती?

The version with हो can sound a bit fuller or more explicit, while the shorter version is very natural in conversation.

तुम is the informal or familiar you. It is common with friends, siblings, classmates, younger people, or people you know well.

Hindi has different levels of you:

• तू = very intimate / very informal
• तुम = familiar, common informal
• आप = polite / respectful

So this sentence is not very formal. If you wanted a polite version, you would say:

• आप कार से क्यों नहीं जाती हैं?
  if speaking to one woman respectfully

You would usually change जाती हो to जाते हो.

So:

• तुम कार से क्यों नहीं जाते हो? = said to a man/boy

That is because the verb changes for gender:

• feminine: जाती
• masculine: जाते

It is best understood as the habitual present or general present.

It often means something like:

• Why don’t you go by car?
• Why do you not go by car?
• Why aren’t you going by car? in some conversational contexts

Hindi habitual forms like जाती हो often cover ideas that English expresses with do/does or sometimes with a broader present-time meaning.

Usually, जाती हो suggests a habitual/general idea: Why don’t you go by car?

But in real conversation, depending on context and tone, it can also be used for a current situation, especially if the speaker is asking why the person is not choosing that option right now.

So Hindi can be a bit broader here than English. Context tells you whether it means:

• a general habit
• a specific situation today

Yes, Hindi word order is somewhat flexible, though some orders are more natural than others.

The given sentence:

• तुम कार से क्यों नहीं जाती हो?

is perfectly natural.

You may also hear:

• तुम क्यों कार से नहीं जाती हो?
• कार से तुम क्यों नहीं जाती हो?

These can shift emphasis slightly, but the original order is very normal and neutral.

Hindi does not need a helper verb like English do in this kind of sentence.

English says:

• Why do you go...?
• Why don’t you go...?

Hindi simply uses the main verb form plus negation and context:

• क्यों जाती हो?
• क्यों नहीं जाती हो?

So you should not try to translate English do word-for-word here.

Yes, कार is fine and very common, but Hindi speakers may also use other words depending on context.

For example:

• गाड़ी से = by vehicle / by car
  This is also extremely common in everyday speech.

So a speaker might also say:

• तुम गाड़ी से क्यों नहीं जाती हो?

In many situations, गाड़ी sounds very natural in conversation.

It depends on how you say it.

It can be:

• a neutral question: asking for a reason
• a suggestion: Why don’t you go by car?
• mild surprise: Why aren’t you going by car?
• gentle criticism: Why don’t you just go by car?

Hindi often relies a lot on tone of voice and context, so the same sentence can sound curious, helpful, or slightly reproachful depending on delivery.