मैं आज नए कपड़े पहन रही हूँ, क्योंकि काम जल्दी शुरू होगा और देर से खत्म होगा।

रही हूँ is the feminine singular form of the present progressive, so it tells you two things at once:

• the action is happening right now / around now
• the speaker is female

So मैं ... पहन रही हूँ means I am wearing / putting on ...

If the speaker were male, it would be:

• मैं आज नए कपड़े पहन रहा हूँ।

This is a very common pattern in Hindi:

• मैं खा रहा हूँ / खा रही हूँ = I am eating
• मैं जा रहा हूँ / जा रही हूँ = I am going

Because कपड़े is plural, and the adjective has to agree with it.

• नया = new (masculine singular)
• नए = new (masculine plural, or masculine oblique in some contexts)

Here, कपड़े is masculine plural, so नए is the correct form:

• नए कपड़े = new clothes

Compare:

• नया कपड़ा = a new piece of cloth / a new garment
• नए कपड़े = new clothes

In everyday Hindi, when talking about clothing in general, कपड़े is much more natural.

Yes. In Hindi, कपड़े is very commonly used as a plural noun meaning clothes as a general category, just like English clothes.

So:

• मैं नए कपड़े पहन रही हूँ = I am wearing new clothes

Even if someone is really talking about one outfit, Hindi often still uses कपड़े naturally. It refers to what someone is wearing overall, not necessarily to a count of separate items.

Yes, Hindi often drops the subject pronoun when it is clear from context.

So both of these are possible:

• मैं आज नए कपड़े पहन रही हूँ...
• आज नए कपड़े पहन रही हूँ...

The ending रही हूँ already shows first person singular and also suggests the speaker is female, so मैं is not always necessary.

However, including मैं can make the sentence clearer, more explicit, or slightly more emphatic.

Yes, आज is flexible. Hindi word order is fairly flexible compared with English, as long as the verb stays toward the end.

These are all possible:

• मैं आज नए कपड़े पहन रही हूँ
• आज मैं नए कपड़े पहन रही हूँ
• नए कपड़े मैं आज पहन रही हूँ
  (more marked, used for emphasis)

The most neutral versions are usually:

• मैं आज...
• आज मैं...

So the sentence you were given is very natural.

क्योंकि means because. It introduces the reason:

• मैं आज नए कपड़े पहन रही हूँ = I am wearing new clothes today
• क्योंकि... = because...
• काम जल्दी शुरू होगा और देर से खत्म होगा = work will start early and finish late

So the second part explains the reason for the first part.

A learner should also know that Hindi often pairs क्योंकि with a result clause before it, just as in this sentence. Another common way to express reason is with इसलिए:

• काम जल्दी शुरू होगा और देर से खत्म होगा, इसलिए मैं आज नए कपड़े पहन रही हूँ।

That version means essentially the same thing, but with so / therefore instead of because.

Because they describe something that has not happened yet.

• काम जल्दी शुरू होगा = work will start early
• देर से खत्म होगा = it will finish late

The future marker here is होगा, which agrees with काम.

Since काम is treated as masculine singular, the sentence uses:

• होगा = will be / will happen (masculine singular form)

If the subject were feminine singular, you would get होगी instead.

Because both verbs refer back to the same subject, काम.

Structure:

• काम जल्दी शुरू होगा
• और = and
• (काम) देर से खत्म होगा

In the second part, काम is understood and not repeated, but it is still the subject. Since काम is masculine singular, both future verbs use होगा.

This kind of omission is very common in Hindi, just as in English:

• Work will start early and finish late.

English also does not repeat work in the second part.

This is a very common point of confusion.

• जल्दी works naturally as an adverb meaning early / quickly / soon, depending on context.
• देर से is the usual adverbial expression meaning late.

So:

• जल्दी शुरू होगा = will start early
• देर से खत्म होगा = will finish late

Hindi often uses से in time expressions like this.
Compare:

• वह जल्दी आया। = He came early.
• वह देर से आया। = He came late.

You may hear देर in other structures, such as:

• देर हो गई। = It got late. / It became late.
• देर मत करो। = Don’t be late / Don’t delay.

But in this sentence, देर से is the natural choice.

It can lean either way depending on context, but here it most naturally means I’m wearing or I’m getting dressed in new clothes today.

The verb पहनना means to wear / to put on. In the progressive:

• पहन रही हूँ

it can describe the ongoing action of putting clothes on, or the broader present situation of wearing them.

Because of आज and the reason clause, the sentence sounds like:

• I’m wearing new clothes today because work will start early and end late.

So it is not necessarily focused on the exact moment of putting them on; it is more about the choice of clothes for today.

काम usually means work. In this sentence it refers to the workday, job, or work schedule in a general sense.

So:

• काम जल्दी शुरू होगा = work will start early
• देर से खत्म होगा = it will end late

It does not have to mean a specific task only. It can refer more broadly to the day’s work or working hours.

Also, grammatically, काम is treated as masculine singular, which is why you get होगा.

Yes. That is very close to the Hindi structure.

Hindi often builds sentences in this straightforward way:

• statement
• क्योंकि
  • reason
• verb at the end of each clause

So the structure is:

• मैं आज नए कपड़े पहन रही हूँ
• क्योंकि
• काम जल्दी शुरू होगा
• और देर से खत्म होगा

This is completely normal Hindi. English may sometimes prefer a slightly smoother phrasing, but the Hindi sentence itself is very natural.

In this sentence, repeating होगा is the normal and clear choice:

• काम जल्दी शुरू होगा और देर से खत्म होगा

Hindi commonly repeats the auxiliary in coordinated clauses like this. It sounds complete and balanced.

You may sometimes hear shorter or more compressed speech in conversation, but for learners, the full form with both होगा words is best to learn and use.