the more commonly used verbs taking ‘por/para/con’ with an infinitive:-

 

The following is a list of the more commonly used verbs taking ‘en’ with an infinitive:-

Complacerse en	To take pleasure in	Tener éxito en	To succeed in
Consentir en	To consent to	No tener éxito en	To fail to
Consistir en	To consist of	Hacer bien (mal) en	To do well (badly) in
Convenir en	To agree to	Insistir en	To insist on
Deleitarse en	To take a delight in	Ocuparse en	To be busy with
Divertirse en	To amuse oneself in	Pensar en	To think of
Dudar en	To hesitate to	Persistir en	To persist in
Empeñarse en	To insist on	Quedar(se) en	To agree to/on
Entretenerse en	To amuse oneself in	Tardar en	To take time to
Esforzarse en	To strive to	Vacilar en	To hesitate to

The following is a list of the more commonly used verbs taking ‘por/para/con’ with an infinitive:-

Acabar por	To finish by	Interesarse por	To be interested in
Comenzar por	To begin by	Servir para	To be used for
Empezar por	To begin by	Estar para	To be about to
Estar por	To still to be done	Soñar con	To dream of
Luchar por	To fight for	Amenazar con	To threaten with
Felicitar por	To congratulate on	Contar con	To count on

more info : www.jwitney.net/notes/docs/spanish/lang/sp_prepositions.doc