I strongly need someone's help to solve this problem of grammaticality:
I have to say why these examples are ungrammatical.
- Which book did you make the suggestion that the children should read?
- Which book did you make the suggestion that the children should keep?
In relation to this, we have the grammatical counterparts.
- Which book did the children read?
- Which book did the children keep?
I am blocked because I think it is not a problem of subjacency, since it is only one bounding node being crossed (book). Maybe it is a problem of the type of verb, or maybe it deals with the issue of the relative clause [that the children should read].