Hey everyone,
Marking a bunch of papers at the moment and have come up against one of those 'but it just sounds wrong' sentences... but I can't for the life of me prove what's wrong with it.
I've tried Swan, I've tried the internet, and now I'm going to bug you with it

.
"... the relationship between us became more and more deep
gradually...'
My problem is with the position of 'gradually' in the sentence. I know that adverbs of manner can be put at the end of a sentence ie 'She walked quickly', but here, the adverb is so far away from the verb it just seems wrong.
Am I crazy?