Are you afraid of phrasal verbs or do you dare to face them up? Try this Cambridge University Press app to solve your doubts, Phrasalstein. You can use the language English or Spanish at the right top of the page.
For example you know the meaning of go and the preposition off separatedly but what is the meaning of the verb go off? here you can see the meaning from the context:
'The bomb wet off at noon'
'Exploit' is not the only meaning, whe some food is in bad condition, when you split up with some friend....
At the beginning you can choose to have a look on the phrasal verbs meaning or to start with the exercises, each definition is shown with some kind of funny sketches in which Dr Phrasalstein appears with some witches, monsters...
This app is terrific!