> Prefixes that are always inseparable are: be-, emp-, ent-, er-, ge-, miss-, ver-, & zer-. The most common of these is ver-.
> These [separable prefixes] are most frequently prepositions (e.g, ab, an, auf, aus, bei, mit, nach, statt, vor, zu) or adverbs (e.g., fort, los, nieder, vorbei, weg, zurück, zusammen). However, nouns and adjectives can also serve as separable prefixes (e.g., teilnehmen, festhalten).