यह सबक आसान है।

है is the present-tense form of the verb to be for he/she/it/this/that and singular nouns in general.

So in यह सबक आसान है, है works like is in English:

• यह = this
• सबक = lesson
• आसान = easy
• है = is

Hindi often places the verb at the end, so है comes last.

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

So:

• English: This lesson is easy
• Hindi: This lesson easy is

That is completely normal in Hindi. The verb often comes at the end of the sentence.

यह means this (and sometimes he/she/it, depending on context).

In this sentence, it means this, because it is pointing to सबक:

• यह सबक = this lesson

A very common pronunciation in speech is yeh, even though it is written यह.

In careful spelling, it is written यह, but in modern spoken Hindi it is very often pronounced yeh.

So learners usually hear:

• यह → yeh

This is very common and natural. You do not need to force a strict yah pronunciation in normal conversation.

सबक is a masculine noun meaning lesson.

It is commonly used for a lesson in a book, class, or something learned from experience. In this sentence, it simply means lesson.

You may also see another word, पाठ, which can also mean lesson. Both exist, but सबक is very common and natural.

आसान is an adjective meaning easy, and it usually stays the same regardless of gender or number in everyday use.

So you can say:

• यह सबक आसान है = This lesson is easy
• यह किताब आसान है = This book is easy
• ये सवाल आसान हैं = These questions are easy

Unlike some Hindi adjectives, आसान does not typically change like अच्छा / अच्छी / अच्छे.

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

So सबक can mean:

• a lesson
• the lesson
• just lesson

The exact meaning depends on context. In यह सबक आसान है, the word यह already makes it clear that we mean this lesson, so no article is needed.

In standard Hindi, for singular this, यह is the expected form in writing.

• यह सबक आसान है = This lesson is easy

In speech, people often pronounce यह as ये, so you may hear something that sounds like ye sabak aasaan hai. But in careful standard writing, singular this is यह.

Be careful, because ये in writing usually means these or they.

Because सबक is singular.

• Singular: है = is
• Plural/respectful: हैं = are

So:

• यह सबक आसान है = This lesson is easy
• ये सबक आसान हैं = These lessons are easy

In this sentence, आसान comes after the noun because it is part of the predicate:

• यह सबक आसान है
• literally: This lesson easy is

This is different from using an adjective directly before a noun, like:

• आसान सबक = easy lesson

So both are possible, but they do different jobs:

• आसान सबक = an easy lesson
• सबक आसान है = the lesson is easy

In very casual speech, people sometimes drop है, especially in conversation:

• यह सबक आसान

But in standard, complete Hindi, especially in writing or careful speech, you should include it:

• यह सबक आसान है

So for learners, it is best to keep है.

A simple pronunciation guide is:

यह सबक आसान है
yeh sabak aasaan hai

A rough sound breakdown:

• यह = yeh
• सबक = suh-buk / suh-bak
• आसान = aa-saan
• है = hai (like high, but shorter and lighter)

A natural rhythm is:

yeh sabak aasaan hai

Yes, it is completely natural and grammatically correct.

It is a very standard simple Hindi sentence:

• demonstrative: यह
• noun: सबक
• adjective: आसान
• verb: है

This pattern is extremely common in Hindi, so it is a good model to learn from.