Some students may run down the staris (否定句)Some students------ -------run down the stairs

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Some students may run down the staris (否定句)Some students------ -------run down the stairs
Some students may run down the staris (否定句)
Some students------ -------run down the stairs

Some students may run down the staris (否定句)Some students------ -------run down the stairs
Some students may run down the staris有以下两种情况考虑:
1)这是一个表示推测的句子,意思是:有些学生可能向楼下跑.所以,否定句应该是:
Some students may run down the staris有些学生不可能向楼下跑.
2)这是一个表示允许的句子,意思是;有的学生可以向楼下跑.所以,否定句应该是:
Some students can‘t run downstairs.有的学生不能向楼下跑.
No students can run downstairs.学生不得向楼下跑.
Any student mustn’t run downstairs.禁止任何学生向楼下跑.