（3）形容词后缀
-able，-ible
suit——suitable
question——questionable
nature——natural
structure——structural
-an，-arian，-ian
suburb——suburban
Canada——Canadian
-ant，-ent
differ——different
please——pleasant
-ary，-ory
advise——advisory
custom——customary
-ate
consider——considerate
fortune——fortunate
-en
gold——golden
wood——wooden
-ese
China——Chinese
Japan——Japanese
-free
care——carefree
duty——duty-free
-ful
care——careful
pain——painful
-ic，-ical
atom——atomic
psychology——psychological
-ish
girl——girlish
child——childish
-ive
create——creative
support——supportive
-less
hope——hopeless
pain——painless
-like
child——childlike
lady——ladylike
-ly
man——manly
month——monthly
-ous，-ious
danger——dangerous
poison——poisonous
-some
tire——tiresome
trouble——troublesome
-ward
down——downward up——upward
-y
guilt-guilty noise-noisy
（4）副词后缀
-ly
easy-easily heavy-heavily
-ward，-wards
east-eastward（s） north-northward（s）
-wise
clock-clockwise