My mother goes to work by bus.
否定句：
My mother doesn't go to work by bus.
一般疑问句：
Does your mother go to work by bus?
肯定回答：
Yes,she does.
否定回答：
No,she doesn't.
划线提问：
如果画的是by bus:
How does your mother go to work?
如果画的是my mother:
Who goes to work by bus?
We go to school on foot.
否定句：
We don't go to school on foot.
一般疑问句：
Do you go to school on foot?
肯定回答：
Yes ,we do.
否定回答：
No,we don't.
划线提问：
如果画的是on foot:
How do you go to school?
如果画的是we:
Who goes to school on foot?
因为“两种回答”中已经包括否定回答了,我把你题目中要求的“否定回答”理解成“否定句”了；
另外因为没有说清楚划线的具体是哪部分,所以我从两个角度理解.
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