Question

We have to wear a uniform at school.改为否定句

We have to wear uniform at school.改为否定句

Answer 1

应该是：

We don't have to wear a uniform at school
我们上学时没必要穿校服

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Answer 2

have to 不得不，否定是 不必 needn't

We needn't wear a uniform at school. 在学校我们不必穿校服。

Answer 3

解答如下：
We don't have to wear a uniform at school.
我们不需要在学校穿校服。

Answer 4

We need‘t wear a uniform at school.