Notes:

Here we see the classic sentence with a locative prepositional phrase using the preposition 在 zài + object. As in English, the preposition always precedes the object of the preposition within the prepositional phrase. Unlike in English, in most cases the verb (or verbal adjective) always comes after the prepositional phrase; for example, in English we don't say "I in the classroom study", although this is exactly how you would phrase it in Mandarin.

The pattern for a sentence with a prepositional phrase is subject + preposition + object of the preposition + verb phrase.