Does Prepositions usually come before verbs?

Prepositions generally come before nouns or pronouns, forming a prepositional phrase. This phrase then acts as an adjective or adverb modifying the verb.

Example:

* The cat sat on the mat.

* "on the mat" is the prepositional phrase

* "on" is the preposition

* "the mat" is the noun

* "on the mat" modifies the verb "sat"

Exceptions:

There are some exceptions to this rule, such as:

* Phrasal verbs: Some verbs are combined with prepositions to form a new meaning. The preposition can come after the verb.

* Example: "look up" (meaning to search for information)

* In certain expressions: Some expressions are idiomatic and don't follow the standard prepositional phrase structure.

* Example: "up for grabs"

So, in general, prepositions come before nouns/pronouns, but there are some exceptions.