It’s not syntax, I don’t think: Neg-raising and parentheticals
(i) There is beer in the fridge, I think.
(ii) *There is beer in the fridge, I don’t think.
It has been noted that when the clausal parenthetical contains a Neg-raising predicate, an apparent doubling of a negation in the main clause is allowed, as in (iii).
(iii) There is no beer in the fridge, I (don’t) think.
This doubling has been taken to be an argument in favor of syntactic approaches to Neg-raising, as in Ross (1973) and Collins & Postal (2014). I will defend an analysis of the doubling in (iii) that is compatible with a semantic/pragmatic approach to Neg-raising, as in Horn 1989, Gajewski 2007, Romoli 2013.