你是哪个年级呀?介词prep.有in, on,of, from,by,with,for,to等,一般构成介词短语使用,如：I was born in 1997;冠词有定冠词the和不定冠词a, an,一般修饰名词；代词有I,she, he, my, her,his, me, her, him, it, 等；...