teach(第三人称单数): teaches
use(现在分词): using
idea(名词复数): ideas
big(比较级): bigger
happy(最高级): happiest
good(比较级): better
many(最高级): more
five(序数词): fifth
too(同音词): two, to
America(形容词):American
teaches
using
idea(不可数名词)
bigger
happiest
better
most
fifth
two
American
teaches
used
ideas
bigger
happnest
better
most
fifth
two
American