How many prepositional phrases are in this sentence?

after we finished lunch, we went into the little shops across the street.

A prepositional phrase includes the preposition and its object that is used as a modifier. In this sentence, there are THREE prepositional phrases. These prepositional phrases include: "after we finished lunch", "into the little shops" and "across the street". The prepositions used in these phrases are after, into and across.