What is the prep phrase of English IX - Skills Parts Speech Type prepositional in this sentence. The world has seen many wars but two twentieth century have been pa?

Here's why:

* Prepositional phrases begin with a preposition and end with a noun or pronoun (called the object of the preposition).

* "In" is the preposition.

* "this sentence" is the object of the preposition.

The rest of the sentence is unrelated to the prepositional phrase.