वह आदमी रसोई से चाय ला रहा है, और बहन बाज़ार से फल ला रही है।

Here वह is acting like that, because it comes before a noun: वह आदमी = that man.

When वह stands alone, it can mean he, she, or that one, depending on context. But before a noun, it is usually demonstrative: that.

Also, in everyday speech, वह is very often pronounced वो.

Here से means from.

So:

• रसोई से = from the kitchen
• बाज़ार से = from the market

Hindi uses postpositions instead of prepositions. In English, from comes before the noun; in Hindi, से comes after it.

This same से can also mean other things in other sentences, such as with, by, or than, but here it clearly marks the source.

Hindi usually follows Subject-Object-Verb order, while English usually uses Subject-Verb-Object.

So Hindi says something closer to:

That man [from the kitchen] tea bringing is, and sister [from the market] fruit bringing is.

That is why चाय and फल come before the verb.

A very common pattern in Hindi is:

subject + object + verb

and the main verb usually comes near the end of the clause.

This is the present progressive form, used for an action that is going on right now.

It is built like this:

• ला = bring
• रहा / रही = ongoing action marker
• है = is

So:

• ला रहा है = is bringing (masculine singular)
• ला रही है = is bringing (feminine singular)

The dictionary form of the verb is लाना, meaning to bring.

Because ला रहा है means the action is happening right now or is in progress.

Compare:

• वह चाय लाता है = He brings tea / He usually brings tea
  This is more habitual or general.
• वह चाय ला रहा है = He is bringing tea
  This means the action is happening now.

So in this sentence, the progressive form is used because both people are in the middle of bringing something.

Because रहा / रही / रहे changes to match the gender and number of the subject.

Here:

• आदमी is masculine singular, so: ला रहा है
• बहन is feminine singular, so: ला रही है

This is a very important pattern in Hindi:

• masculine singular: रहा
• feminine singular: रही
• plural or respectful: रहे

So the form changes because the subjects are different.

Hindi does not have articles like English a, an, and the.

So a noun like आदमी can mean:

• a man
• the man
• sometimes just man

The exact meaning depends on context.

The same is true for बहन and other nouns. Hindi usually leaves definiteness to be understood from the situation rather than marking it with a special word.

Hindi often uses kinship words like बहन, भाई, माँ, पिता without an article-like word when the person is already understood from context.

So बहन can simply mean:

• sister
• the sister

depending on the situation.

If you wanted to be more specific, you could say:

• वह बहन = that sister
• एक बहन = a sister
• उसकी बहन = his/her sister

So the bare form बहन is very natural if the identity is already clear.

Because direct objects in Hindi do not always take को.

In this sentence, चाय and फल are inanimate things and are being mentioned in a general, straightforward way, so को is not needed.

Hindi commonly uses को with:

• animate objects
• very specific or definite objects
• certain other special cases

But with ordinary inanimate objects like tea and fruit, leaving out को is very normal.

So:

• चाय ला रहा है = natural
• फल ला रही है = natural

It can mean either, depending on context.

In this sentence, फल most naturally means fruit in a general or collective sense, like some fruit or fruit(s).

Also, फल is one of those Hindi nouns whose direct singular and direct plural forms look the same, so you do not see a separate plural ending here.

That means:

• फल can be singular or plural in form
• context tells you the intended meaning

So the sentence can be understood naturally as someone bringing fruit from the market.