一、改变时态例:The bell is ringing now. 一般 There goes the bell.特殊 二、改变语态 例: People suggest that the conference be put off.一般 It is suggested that the conference be put off.特殊三、使用不定式 例: He is so kind that he can help me.一般 He is so kind as to help me. 特殊四、使用...