Prefixes are used to vary the meaning of the root of the word. Negative prefixes include un-, ir-, in-, il-, dis- and the next youtube English lesson explains which prefix to use in different situations. The following prefixes are covered in the class.

Prefixes lesson 1

over – overcharge, overwork, overrated, oversleep
under – underestimate, understaffed, underpaid
ir (r) – irreversible, irresponsible, irregular, irrational
ig (n) – ignoble
il (l) – illegal, illiterate, illogical, illegible,
im (m,p) – impossible, immature, immaterial, impatient
in – inadequate, inconsequential, inconsiderate, inconsistent, insincere

Prefixes lessonĀ 2

There are many more prefixes with different meanings. Have a look at the following list, and listen to the class to find out more about the meaning of these words. Knowing many of these prefixes is essential in both CAE or FCE.

anti-establishment, anti-clockwise, antichrist
contradiction, controversial, contraband
asymmetric, asexual, anhydrous, anonymous
international, interact, intermolecular
intracellular, intra molecular bond
malformed, malpractice, malevolent
multinational, multicoloured
polyglot, polygamy
paranormal, paramilitary
pseudonym, pseudo science

And test your word formation skills with the following quiz

PREFIX EXERCISE

Here are some more common prefixes. See if you can guess the meaning of the words

de (opposite) defrost, deactivate, decompress
dis (negative) dishonest, dishonour, disbelief, dislike, disability, disagree
fore (before) forearmed, forewarned
mis (wrongly) miscalculate, misinform, misunderstand
pre (before) prefix, pre-empt, prepay, pre-war
re (again) return, retell, reappear
sub (under) subway, submarine, subordinate
super (above) superiority, superlative, superego, supererogatory