\(\underline{\mathrm {To \space win \space a prize }}\) is my ambition.’ The underlined part of the sentence is a/an-

  • adjective phrase
  • noun phrase
  • adverb phrase
  • conjunctional phrase

When a group of words put together and works as noun is called noun phrase. ‘To win a prize’ এটি বাক্যে noun এর কাজ করছে তাই এটি noun phrase.