I admit I was a little fast on the trigger eventhough I was the one with the wrong information. I live in a country where English isn't the primary language so if these usages sound weird to you, they sound even weirder to me. Thank you for your responses, they really opened my eyes.

Sorry for having to write another thread but I just thought of more examples, like how about if its followed by an article and a noun: "I've a headache". Or just a noun for that matter: "I've food in the bag". I feel inclined to believe that these are wrong and that there should be a good basis on it's syntax somewhere, but I can't find it. I just want to show it to some friends who keep using that kind of syntax.

Okay how about contraction followed by "to"?
For example:
"I've to go",
"You've to do it"