I tend to see the first sentence to have more doubt implied, but that's largely because I'm conditioned to see it that way because of a knowledge of French (which you may see as well). However, I am sure that most English speakers see no difference between the two sentences.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
AnonymousIs there any difference in the meaning between two sentences?No. In English it is customary to transfer a negation in the residual clause to the main clause in statements of belief.