this means on; so we have shore and ashore; board and aboard.
this implies a change; so we have code and decode; grade and degrade.
this makes the opposite; so we have appear and disappear; like and dislike.
this makes the opposite; so we have legal and illegal; logical and illogical.
this makes the opposite; so we have possible and impossible; practical and impractical.
this makes the opposite; so we have valid and invalid; capable and incapable.
this makes the opposite; so we have relevant and irrelevant; rational and irrational.
this makes the opposite; so we have understand and misunderstand; guide and misguide.
this implies before; so we have judge and prejudge; caution and precaution.
this implies again; so we have do and redo; order and reorder.
this implies more or above; so we have sonic and supersonic; natural and supernatural.
this makes the opposite; so we have true and untrue; common and uncommon.
Some of the suffixes and prefixes we have shown you imply or denote similar meanings, but you must learn which suffix or prefix can be used with a particular root word. For example, you can say disagree, but not unagree; you can say dependant, but not dependness.
Experience will help you to learn how to form new words correctly, but you must remember to use your dictionary.
Also, in some cases a prefix and a suffix can both be added to the same root word; for example, wise, unwise, unwisely; possible, impossible, impossibility.
Common Prefixes to HOME PAGE