New2grammarCan I say "He couldn't have been paying attention" instead?
To me, yes, with not a great deal of difference in meaning. "Couldn't" just makes it seem a bit more in doubt that he wasn't paying attention.
New2grammarI was told a couple usually takes the preposition of though it is also correct without. If I wan tto include a 'of', where should I put it, before or after more?
I would never use "of" with "more" here.
A couple of examples -- yes
A couple examples -- for me, no (sounds like an Americanism -- not sure if it is)
A couple more of examples -- definitely not
A couple of more examples -- definitely not