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
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