Ont-vries = De-frost; Ont-ken = denied (ken is know). It is many times an anti word, but not every time you see ont in front of a word does it meen this, as some words just so happen to have the three letters o n t at the beginning. Ontmoet = meet. (noun) encounter. (adj); Ontleed = analyzed Be-; Ve- in my personal opinion is also just two letters that happen to be next to each other often at the beginning of words.

The prefixes can change the meaning or the tense. ie " het gekoop" is past tense "I bought". Verkoop means I sell. GE normally indicates past tense. Ek het gelag - I laughed. Ek het geloop I walked. HER normally means the same as RE in english. i.e. Herwin = recoup and herinner means remind.

've-' ....I think this is usually 'ver-' 'ver-' can change the meaning of a word eg: as mentioned in another answer, koop=buy, verkoop=sell or wag=wait, verwag=expect or it can change the form of the word eg: beeld=image (noun), verbeel=imagine(verb) 'be-' can also change the form of a word eg ken=know (verb) bekend=known (adjective/past participle) (het geken = knew) ***TAKE NOTE: 'ge-' doesn't always indicate past tense - it can be part of the word eg there are a few nouns starting with 'ge-' eg gedig = poem Sometimes it is part of a verb in the root form. I can't think of examples, but when you find these, and also verbs that have the prefixes that have been discussed here in your question, THEY DON'T use 'ge-' again in the past tense eg I buy=ek koop, I bought=ek het gekoop I sell=ek verkoop, I sold=ek het verkoop - NOT ek het geverkoop

It's ok Thank you so much anyway!

I would say that in general they indicate action and are used mainly with verbs. But although I speak the language fluently I am not a grammar expert.