The bridgewith its unique architecturespans across the river. Here the underlined phrase is

• The bridge with its unique architecture spans across the river. Here the underlined phrase is - Both a prepositional phrase and an adjective phrase.

• Prepositional Phrase:
- যে Phrase – Preposition দিয়ে শুরু হয়, কিন্তু Adjective বা Adverb এর কাজ করে, তাকে Prepositional Phrase বলে।
- এখানে with its unique architecture - Phrase-টি The bridge এর adjective হয়েছে এবং এটি with - Preposition দিয়ে শুরু হয়েছে।
- তাই এটি একটি Prepositional Phrase and adjective phrase.

Other examples:
- A man of high intellect often feels lonely. (Prepositional Phrase/ Adjective Phrase)
- He went there with a jolly mind. (Prepositional Phrase/ Adverb Phrase)