यह

In a sentence

• यह एक किताब है।

  This is a book.

  In this sentence, 'यह' is used as a demonstrative pronoun, referring to the object being talked about.

• यह पुस्तक बहुत रोचक है।

  This book is very interesting.

  Here, 'यह' acts as a demonstrative adjective modifying the noun 'पुस्तक', describing which book is interesting.

• यहाँ बहुत ठंड है।

  It is very cold here.

  In this sentence, 'यह' is part of the term 'यहाँ', meaning 'here', giving a sense of the location being described.