试卷中有这样一道题目是把Keep off the grass .改为否定句．使把他改为Don't keep off the grass 还是 Don't walk on the grass

这个要问出考卷的老师了,你做的两个答案都有道理啊.

我认为否定句的话应该用Don't keep off the grass.不就是祈使句的否定句吗？
Don't walk on the grass.是这个句子的同义句．

同意上面的观点

该是Don't keep off the grass