Some adjectives are always combined with specific prepositions. For example: I am proud of you. The adjective “proud” is always combined with the preposition “of”. Other examples of adjectives that pair with specific prepositions are: keen on, sorry for, pleased with, interested in.

Some verbs are also always combined with specific prepositions. For example: Thank goodness my father approves of my haircut. The verb “approve” is always combined with the preposition “of”. Other examples of verbs that pair with specific prepositions are: believe in, rely on, wait for, object to.

Note that some verbs do not take a preposition, for example: love, discuss, order, marry, enter, lack, approach.