How do prefixes and suffixes and roots affect meaning?

Answer:
Prefixes change the meaning by doing something before or after. Ex:

Pre- before doing
Re- Doing again

A suffix does the opposite. Ex:

-ed- Did something Ex: He created... PIE :D
First answer by Harry Potter The Great. Last edit by Harry Potter The Great. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 1 [recommend question].