问题
选择题
. — What does the sign over there read?
—“No person __________ smoke or carry a lighted cigarette，cigar or pipe in this area.”
A．will
B．may
C．shall
D．must
答案
C。
shall在陈述句中用于第二人称和第三人称时，可表示说话者的允诺、告诫、威胁、命令、规定、必然性等，如：You shall suffer for this. 你会为此事吃苦头的。(表威胁) Tell him that he shall have the book tomorrow. 告诉他这本书明天给他。(表允诺) Persons under 18 shall not be employed in night work．不满18岁的人不得雇佣干夜间工作。(表规定)