The signs mean ‘No parking’.一般疑问句 It means we shouldn't take photos.（否定句）
问题描述：
The signs mean ‘No parking’.一般疑问句 It means we shouldn't take photos.（否定句）
答
What do the signs "No Parking " mean ?
It doesn't mean we shouldn't take photos.
答
Does the sign mean "No parking."?
It doesn't mean we shouldn't take photos.
答
正确答案（按先后次序）
Do the signs mean ‘No parking’?
It doesn't mean we shouldn't take photos.
解析：第一句是不含有be动词与情态动词的非三单句型，做这类题时，要提前助动词do就可以(在一般现在时）了。
第二句你按三单处理就可以了，而且以主句为准。这样讲可以了吧？
答
Does the signs mean "No parking"?
It doesn't mean we shouldn't take photos?
答
Do the signs mean ‘No parking’?
It doesn't mean we shouldn't take photos.