1. Prefixes, Suffixes, and Base Words
Learn how to use prefixes, suffixes, and base words to find the meaning of words.

2. Base Words A base word is a word in its simplest form. A
base word has nothing added to it.
Examples: Do
Heat
Write
Read
Pack

3. Write the base words for the following words.
Played
Running
Reheat
Quickly
Unhappy

4. Prefixes Un + happy = unhappy Re + do = redo
Prefixes are added to the beginning of a base word. They change the meaning of the base word.
Un + happy = unhappy
Re + do = redo

5. What do the words reheat and unclear mean?
Prefixes
The prefix un- means not or the opposite of.
Uncomfortable means not comfortable.
Unpack means the opposite of pack.
The prefix re- means again.
Reread means to read again.
Rewrite means to write again.
What do the words reheat and unclear mean?

6. Suffixes wonder + ful = wonderful rest + ful = restful
Suffixes are added to the end of a base word. They change the meaning of the base word.
wonder + ful = wonderful
rest + ful = restful

7. Suffixes The suffix -ly means in a certain way.
Quickly means in a quick way.
Loudly means in a loud way.
What does suddenly mean?
The suffix -ful means full of.
Colorful means full of color.
Playful means full of play.
What does thankful mean?

8. Match each word with its definition.
healthful
in a sad way
to heat again
slowly
the opposite of lock
unlock
reheat
to read again
sadly
full of health
uncomfortable
in a slow way
reread
not comfortable