Question

We must wear the school uniform at school.怎样变否定

Answer 1

变为否定句是：We don't have to wear the school uniform at school.

must 的句子变为否定句的方法：
must 有非推测性用法和推测性用法两种情态意义，变否定句的方法不同。
▲非推测性用法的must表示义务，情态意义为“必须”。
He must finish his homework before bedtime. 他必须在上床前写完作业。
此用法的must两种否定形式：
1. 结构上否定：在must改为must not或mustn't，情态意义为“不许”。
He mustn't finish his homework before bedtime. 不许他在上床前写完作业。
2. 意义上否定：将must改为need not或needn't，情态意义为“不必”。
He needn't finish his homework before bedtime. 他不必在上床前写完作业。
▲推测性用法的must表示必然，情态意义为“肯定”。
He must finish his homework before bedtime. 他肯定在上床前写完作业。
此用法的否定形式为can't，情态意义为“不可能”。
He can't finish his homework before bedtime. 他不可能在上床前写完作业。

Answer 2

　　We don't have to wear the school uniform at school
　　满意请采纳，谢谢

Answer 3

We needn't wear the school uniform at school.
不能用mustn't
精 锐 教 育