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In a sentence

• क्या ये आपकी किताब है?

  Is this your book?

  Here, 'ये' is used as a demonstrative pronoun meaning 'this'.

• तुम ये खाओ, बहुत स्वादिष्ट है।

  Eat this, it's very tasty.

  In this sentence, 'ये' again acts as a demonstrative pronoun referring to 'this' (food).

• ये सच है कि मेहनत का फल मीठा होता है।

  It is true that the fruit of hard work is sweet.

  Here, 'ये' serves as the subject demonstrative pronoun 'It' to introduce the statement.