使用情态副词可影响整句的真假值。副词比时态更具影响力,即使是过去式,加了maybe,perhaps或probably等具有猜测意味的副词,也可以改变这句话的真实确定性:
He probably wrote a book. →可能写了,但不确定
Maybe he went to the States. →可能去了,但不确定
——劉美君. (2012). 英文文法有道理! 重新認識英文文法觀念. 聯經.
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