Suffixing rules
Root meanings
Suffix meanings
Prefix meanings
100

swim + ing = 

swimming 

100

cred means...

believe

100

-ish means...

somewhat like

100

con-, com- means...

together, with

200

stop + ed =

stopped

200
dict means...

say, tell

200

-ment means...

result or state of
200

dis- means...

not, opposite

300

move + ing = moving, why?

Because when you add the suffix with a vowel, you must take away the e. You cannot have two vowels like moveing.

300

terr means...

land, earth

300

-ology means...

study of

300

trans- means...

across, through

400
beauty + ful =

beautiful

400

vid, vid means...

see

400

-ness means...

state of being

400

sub- means...

under, below

500

Why is happy + ness = happiness?

Because when a word ends in a consonant + y you change to an i. 

500

scrib, script means...

write

500

-ist means...

one who does

500

ex- means...

out of