Thanks for the answer. But you wrote:It's not possible to have the two negative verbs
I would like to say that:
In their book "Mastering English, an advanced grammar for non-native and native speakers
", point (13) at the bottom of page 273 and at the top of the next page, Carl Bache & Niels Davidsen-Nielsen wrote:
" Sentences like the following in which both the declarative clause and the tag clause are negative are RARE
(13) She can't come, can't she?
In cases like this it would seem that the function of the tag is to challenge a view held by the hearer. For example, it would be natural for a speaker uttering (13) to continue his turn with an utterance like Oh yes, she can."
Now, you may say it is RARE
, but it is, too, possible.
What do you think?
Here is the link to the book on AMAZON:http://www.amazon.com/Mastering-English-Advanced-Non-Na.../ref=pd_bxgy_b_img_b