वह लड़की फोन पर हिंदी बोल रही है।

वह can mean either he/she or that, depending on context.

In this sentence, वह लड़की most naturally means that girl or the girl. Since लड़की already tells us the person is female, English translates it as that girl or she depending on context.

A useful thing to remember:

• यह = this / he / she (near)
• वह = that / he / she (far or already known)

Hindi often uses the same word for both a demonstrative (that) and a third-person pronoun (he/she).

No. In Hindi, वह does not change for gender. The same word is used for:

• he
• she
• that

Gender shows up elsewhere in the sentence, especially in:

• the noun: लड़की = girl
• the participle: रही = feminine form

So the sentence is understood as feminine because of लड़की and रही, not because वह itself is feminine.

Because the subject is feminine: लड़की.

In the present continuous, Hindi uses:

• रहा है for masculine singular
• रही है for feminine singular
• रहे हैं for masculine plural / respectful singular in many contexts

So:

• वह लड़का हिंदी बोल रहा है। = The boy is speaking Hindi.
• वह लड़की हिंदी बोल रही है। = The girl is speaking Hindi.

The रही agrees with लड़की.

This is the Hindi present continuous structure.

It is made like this:

verb stem + रहा / रही / रहे + होना

Here:

• बोल = speak
• रही = continuous participle, feminine singular
• है = is

So बोल रही है literally means something like is in the process of speaking.

Very common pattern:

• मैं खा रहा हूँ। = I am eating.
• वह पढ़ रही है। = She is reading.
• वे खेल रहे हैं। = They are playing.

फोन पर means on the phone.

Here:

• फोन = phone
• पर = on, upon, at

So फोन पर is a fixed, natural Hindi way to say on the phone.

Examples:

• मैं फोन पर हूँ। = I am on the phone.
• वह फोन पर बात कर रही है। = She is talking on the phone.

Hindi uses postpositions like पर, which come after the noun, unlike English prepositions, which usually come before:

• English: on the phone
• Hindi: phone on = फोन पर

Hindi usually follows Subject–Object–Verb order, while English usually follows Subject–Verb–Object.

In this sentence:

• वह लड़की = subject
• फोन पर = adverbial phrase
• हिंदी = object / what is being spoken
• बोल रही है = verb phrase

So Hindi puts the main verb near the end:

• English: The girl is speaking Hindi on the phone.
• Hindi: That girl on the phone Hindi speaking is.

That literal English order sounds wrong in English, but it is normal in Hindi.

Yes, in a practical learner sense, हिंदी is what is being spoken, so you can think of it as the object of बोलना.

So:

• हिंदी बोलना = to speak Hindi
• अंग्रेज़ी बोलना = to speak English

Hindi does not need a word like in here. English says speak in Hindi or speak Hindi, but Hindi normally just says:

• हिंदी बोलना

Yes, that is possible.

लड़की फोन पर हिंदी बोल रही है। can mean The girl is speaking Hindi on the phone.

Adding वह makes it more like:

• that girl
• she, depending on context

Hindi often omits things that are already clear, but including वह can help point out or identify the person more specifically.

Good question. Both can be natural, but they mean slightly different things.

• हिंदी बोल रही है = she is speaking Hindi
• फोन पर बात कर रही है = she is talking on the phone

This sentence focuses on the language she is using: Hindi.

If the main point were simply that she is having a phone conversation, Hindi speakers would very often say:

• वह लड़की फोन पर बात कर रही है।

If the point is that she is using Hindi while on the phone, then फोन पर हिंदी बोल रही है works well.

The tricky part is ड़.

लड़की is pronounced roughly like luhR-kee, with a flapped r/d sound in the middle. It is not a plain ड sound.

Breakdown:

• ल = la
• ड़ = retroflex flapped sound
• की = kee

For many English speakers, ड़ is one of the harder Hindi sounds. It appears in words like:

• लड़का = boy
• लड़की = girl

Also, की here is just part of the noun लड़की. It is not the separate word की meaning of.

It is a very common loanword from English phone.

Modern Hindi uses many everyday borrowed words, especially for technology and modern life:

• फोन = phone
• ट्रेन = train
• बस = bus
• डॉक्टर = doctor

Even though फोन comes from English, it behaves like a normal Hindi noun in phrases such as:

• फोन पर
• फोन करना = to phone / to make a call

Yes. That is a very natural translation.

Depending on context, English could render it as:

• That girl is speaking Hindi on the phone.
• The girl is speaking Hindi over the phone.
• She is speaking Hindi on the phone.

Hindi does not force just one of these translations. The exact English version depends on what sounds most natural in the situation.

In Hindi present continuous sentences, the auxiliary होना usually appears only once, at the end of the clause.

So:

• बोल रही है = is speaking
• खेल रहा है = is playing
• पढ़ रहे हैं = are reading

English uses is before the -ing form, but Hindi places the auxiliary after the participle:

• English: is speaking
• Hindi: speaking is = बोल रही है

This is completely normal Hindi structure.