Root word “teach” —to show, illustrate, explain to someone how to do a thing

“re”— again; to do over—”reteach”—to show, illustrate, explain AGAIN

Suffix “er”—a person— “teacher”—someone who shows, illustrates, explains

Many common prefixes and suffixes are based upon Latin or Greek words.
Latin – “efficientem” – ‘work out’ or ‘accomplish’
Synonyms – effective, productive, competent.  
man, bench, grass
de-from, down, away, reverse, oppositedecode, decrease
dis-not, opposite, reverse, awaydisagree, disappear
ex-out of, away from, lacking, formerexhale, explosion
il-notillegal, illogical
im-not, withoutimpossible, improper
in-not, withoutinaction, invisible
mis-bad, wrongmislead, misplace
non-notnonfiction, nonsense
pre-beforeprefix, prehistory
pro-for, forward, beforeproactive, profess, program
re-again, backreact, reappear
un-against, not, oppositeundo, unequal, unusual
-ableable to, having the quality ofcomfortable, portable
-alrelating toannual comical
-ercomparativebigger, stronger
-estsuperlativestrongest, tiniest
-fulfull ofbeautiful, grateful
-ibleforming an adjectivereversible, terrible
-ilyforming an adverbeerily, happily, lazily
-ingdenoting an action, a material, or a gerundacting, showing
-lesswithout, not affected byfriendless, tireless
-lyforming an adjectiveclearly, hourly
-nessdenoting a state or conditionkindness, wilderness
-yfull of, denoting a condition, or a diminutiveglory, messy, victory

Mastering prefixes and suffixes allows students to become more efficient readers.  You have to look at a word and see if it’s:
+ / – AND 0-100%

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