額··貌似高中老師說得很清楚額~現(xiàn)在也記得不太清楚了...好像是動詞不定式做后置定語,一般表示與主句時態(tài)一致的一個經(jīng)常發(fā)生的動作,而過去分詞作后置定語,一般表示被動語態(tài).具體說來說,動詞不定式作定語后置表示要做的事（尚未發(fā)生）,常與名詞有動賓關系,不及物動詞加介詞.現(xiàn)在分詞作定語后置表示名詞性質(zhì)、特征或表示名詞所做的動作（多表示進行、主動）.不定式作定語時的特殊情況：1.表示將要發(fā)生的動作,有時根據(jù)句意需要加上介詞,這時介詞不能省略,因為被修飾的名詞是它的賓語.e.g.The farmers thought of ways to protect their crops.We have only a small cold room to live in.2.用于修飾被序數(shù)詞、最高級或no,all,any等限定的中心詞.e.g.Marie Curie became the first woman in France to be a university professor.She was the first person in the word to receive two Nobel Prize.He was the best man to do the job.3.根據(jù)不同的句意,不定式可用主動語態(tài)或被動語態(tài).e.g.Have you got anything to post?(post的動作執(zhí)行者是“你”) Have you got anything to be posted?(post的動作執(zhí)行者是“我”或“別人”) There are some plates to wash (to be washed).