यह सवाल उस सवाल से आसान है, इसलिए मैं इसका जवाब जल्दी लिख सकती हूँ।

Hindi is contrasting this question and that question.

• यह = this
• वह = that

However, when वह comes before a postposition such as से, it changes to its oblique form उस. So:

• वह सवाल = that question
• उस सवाल से = than that question

The same pattern happens with यह:

• यह सवाल = this question
• इसका जवाब = its answer / the answer to this

So the change is not random; it is part of normal Hindi grammar.

In Hindi, से is the usual word used to make comparisons. It often corresponds to English than.

So the pattern is:

A, B से + adjective + है
= A is more adjective than B

Here:

• यह सवाल = this question
• उस सवाल से = than that question
• आसान है = is easy

So यह सवाल उस सवाल से आसान है literally works like:

This question is easy compared with that question

In natural English, that becomes This question is easier than that question.

Hindi often expresses comparison without a special comparative form like English easier. Instead, it uses:

noun + से + adjective

So उस सवाल से आसान already means easier than that question, even though the adjective itself is just आसान meaning easy.

You can add ज़्यादा for extra emphasis:

• यह सवाल उस सवाल से ज़्यादा आसान है = This question is easier than that question

But it is not required. The comparison is already clear because of से.

Not all Hindi adjectives change their endings. आसान is an invariable adjective, so it stays the same regardless of gender or number.

Compare:

• आसान सवाल = easy question
• आसान किताब = easy book
• आसान बातें = easy things

By contrast, some adjectives do change, such as अच्छा / अच्छी / अच्छे.

So आसान stays आसान whether the noun is masculine, feminine, singular, or plural.

इसलिए means therefore, so, or that is why.

It connects the two ideas:

• This question is easier than that question
• So I can write its answer quickly

So इसलिए shows cause and result.

A very literal breakdown is:

• इस = this
• लिए = for / because of

But as a full expression, you should learn इसलिए as a single connector meaning therefore / so.

इसका जवाब means the answer to this or its answer.

Breakdown:

• इस = oblique form of यह
• का = possessive marker, here matching a masculine singular noun
• जवाब = answer

So इसका जवाब literally means this one's answer.

It refers back to यह सवाल, meaning the speaker is talking about the answer to this question, not that question.

Because का / की / के agrees with the noun that follows, not with the owner.

Here the following noun is जवाब, and जवाब is masculine singular. So Hindi uses का:

• इसका जवाब = its answer

If the following noun were feminine, you would use की:

• इसकी किताब = its book / this one's book

If the following noun were masculine plural or a respectful/plural form, you would use के:

• इसके जवाब = its answers

This is a very common point for English speakers, because English of this does not change, but Hindi possessive forms do.

सकती हूँ shows ability or possibility, and it also shows that the speaker is feminine.

Breakdown:

• लिख = write
• सकती = able/can, feminine singular
• हूँ = am

So लिख सकती हूँ means I can write or I am able to write.

If the speaker were male, it would be:

लिख सकता हूँ

This is one of the places where Hindi shows the speaker's gender very clearly.

जल्दी is an adverb here, meaning quickly.

In Hindi, adverbs often come before the main verb phrase:

• जल्दी लिख सकती हूँ = can write quickly

That is a very natural placement.

You may also hear slightly different word orders in real speech, because Hindi word order is somewhat flexible, but this version is completely normal and easy to understand.

Also, जल्दी can sometimes mean soon depending on context, but here quickly fits best.

Because the subjects are different.

In the first clause, the subject is यह सवाल, which is third person singular, so Hindi uses है:

• यह सवाल ... आसान है = This question is easy

In the second clause, the subject is मैं, which is first person singular, so Hindi uses हूँ:

• मैं ... लिख सकती हूँ = I can write

So the verb form changes to match the subject.

Yes. प्रश्न and सवाल both mean question, but they differ in tone and register.

• सवाल is very common in everyday Hindi
• प्रश्न is a bit more formal, academic, or official

So you could say:

यह प्रश्न उस प्रश्न से आसान है...

That is grammatically fine, but it sounds more formal than the original sentence.

Yes, जवाब लिखना is natural when the answer is being written.

• जवाब लिखना = to write an answer
• जवाब देना = to give an answer

So in this sentence, लिखना makes perfect sense because the speaker is specifically talking about writing the answer.

If the context were speaking aloud, देना might be more natural:

• मैं इसका जवाब जल्दी दे सकती हूँ = I can answer this quickly

But for a written response, लिख सकती हूँ is exactly right.

The given word order is natural, but Hindi allows some flexibility.

Standard version:

यह सवाल उस सवाल से आसान है, इसलिए मैं इसका जवाब जल्दी लिख सकती हूँ।

You might also hear small variations, especially in speech, such as moving जल्दी for emphasis. But beginners should stick with the given order because it is clear and idiomatic.

A useful basic pattern is:

statement 1 + इसलिए + statement 2

and within the second statement:

मैं + object + adverb + verb phrase

That is exactly what this sentence does.