高考英語語法：兩類被動(dòng)句型的轉(zhuǎn)換

　　英語中有一種主動(dòng)句可以轉(zhuǎn)換成兩種被動(dòng)句型，它們通常是一些表示客觀說明的句子，如：

　　People believed that she is honest. 大家相信她是誠實(shí)的。

　　 Its believed that she is honest. 大家相信她是誠實(shí)的。

　　 She is believed to be honest. 大家相信她是誠實(shí)的。

　　比較上面兩類被動(dòng)句型可以發(fā)現(xiàn)，一類是it+be+過去分詞+that從句，另一類則是主語+be+過去分詞+不定式(其中的主語為前一類句型中that從句中的主語)，通常可用于這兩類被動(dòng)句型的動(dòng)詞有assume, believe, expect, fear, feel, know, presume, report, say, suppose, think, understand等，比較(同時(shí)注意其中時(shí)態(tài)和動(dòng)詞形式的變化)。如：

　　Its expected that he will come soon. / He is expected to come soon. 預(yù)計(jì)他很快就會(huì)來。

　　Its expected that he has come. / He is expected to have come. 估計(jì)他會(huì)已經(jīng)來了。

　　Its known that is a good singer. / He is known to be a good singer. 大家知道他是位優(yōu)秀的歌手。

　　Its known that was a good singer. / He is known to have been a good singer. 大家知道他曾是位優(yōu)秀的歌手。