I am learning German, and I am interested to understand the grammatical function of the prefixes ein, be, ver, aus, ab, etc. that are used before a verb and what are they supposed to do with the verb. For example, in a discussion with a friend he told me that somehow be- is supposed to transform a verb referring to one object into a verb referring to two objects. For example:
greifen = grab/keep something
be-greifen = understand = grab something and put it somewhere (into my mind)
I would be very very pleased if someone gave me a link of a small pdf, a reference to book chapter or something to begin with. Because in this way the vast amount of verbs with these prefixes in front, would roughly break down into some categories and a priori would be more understandable.