名词.n,book,pen,map,boy,
形容词good,fine,great,beautiful
动词sit,come,do,have,cry,laugh,
代词this,that,they,we,us,he,she,it,these,
副词well,quickly,wonderfully,carefully
介词in.on,under,
连词and,or,but,
冠词a,an,the,
叹词oh,Hellow,hi,well,
数词one,two,first,hundred,thousand