contaminar - to contaminate, pollute; to corrupt
contar - to count, relate, tell
contener - to contain, hold
contestar - to answer
continuar - to continue
contribuir - to contribute
controlar - to control; to inspect, check
convencer - to convince
convenir - to agree; to suit, be suited to; to be good for
conversar - to talk, converse; to tell, relate
convertir - to convert