Language point

To produce an opposite meaning of a word, we usually add a prefix to it or use a totally different word (e.g. pretty/ugly).

Common prefixes include: un- (happy, unhappy), im- (possible/impossible), il- (legitimate/illegitimate), in- (effective/ineffective), ir- (regular/irregular), dis- (infect/disinfect), non- (metalic/non-metalic), and mis- (inform/misinform).

Can you find in the article words that contain a prefix?

The following words are taken from the article. Give their opposites.

like/opened/similar/difficult/behave/regular/lucky/active

Answers: unseen (line 1), unusual (line 3), invisible (line 26), independent (line 36), disagree (line 46)