Prefixes of loaned verbs in Czech

One of the common means of word formation in the Czech language is
prefixation. We will focus on prefixes attached to the verbs of foreign origin.

There are many loaned verbs in Czech, taken especially from Latin or
English. They keep their foreign root, sometimes together with a foreign
prefix, but the suffix is Czech. The most commen suffix is -ovat. Such verbs
get often the both aspects - perfective as well as imperfective. It might
seem that these verbs may remain as they were taken from another language -
with the only change in the suffix. However, loaned verbs are often
accompanied with a Czech prefix that in fact change nothing in the verb -
neither its meaning, nor its aspect. The reason of such prefix addition is
probably only highliting their perfective status in a particular context.