Other
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.
Lingolex
Lingolex.com: Prepositions of Place: For Beginners
Effective illustrations of some commonly used prepositions that will aid students in learning grammar in both English and Spanish.
Language Guide
Language Guide: Las Preposiciones
Here one can learn the concept of the personal a in the context of Spanish prepositions. Learn when and when not to use the Spanish "a" as a preposition or in the role of the personal a. Also learn how to use subject pronouns as...
Language Guide
Language Guide: Por Y Para
Examples of when to use the prepositions POR and PARA are given. Bulleted items are listed along with sample sentences.