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Bowdoin Coll.: Spanish Grammar: Verbs Followed by Prepositions Before Infinitive
Many verbs need a preposition before an infinitive. This site provides a substantial list of verbs which require a pronoun before an infinitive and the meaning of the phrase it creates.
Colby College
Spanish Language & Culture: #1 "Por" or "Para"
This paragraph provides excellent examples of the varied uses of the prepositions "por" and "para". Pass the cursor over the highlighted preposition to get an explanation of its use.