英语语法大全-句子的转换与合并简单句之间的转换1781 句型的转换是指一个句子由一种语法结构变为另一种语法结构，而不改变其原来的意义。这是一种有用的练习，可以学会许多不同的说法，能从几个句子中挑选出最适当的句子形式。A主动语态与被动语态之间的转换一个句子可以由主动结构变为被动结构，也可从被动结构变为主动结构（参阅12071209）：He has finished his university studiesHis university studies have been finishedThey put him to deathHe was put to deathAn Englishman teaches him English He is taught English by an Englishmen B肯定句与否定句之间的转换一个句子可以由肯定形式变为否定形式，也可由否定形式变为肯定形式：I am doubtful of his honestyI am not sure of his honestyFew un
