इस

In a sentence

• इस पुस्तक को पढ़ो।

  Read this book.

  The word 'इस' is used here as a demonstrative pronoun referring to the nearby object 'पुस्तक' (book).

• मैं इस विषय पर बात करूंगा।

  I will talk about this topic.

  The word 'इस' serves as a demonstrative adjective modifying 'विषय' (topic), specifying which topic is being talked about.

• क्या आपने इस व्यक्ति को देखा है?

  Have you seen this person?

  Here, 'इस' is a demonstrative pronoun used to indicate the person ('व्यक्ति') being referred to.