When I listen to old Tom Lehrer recordings he says,
- I should like to introduce...
and it sounds a bit strange. However, yesterday I was building a shed with my wife and I said, much to my surprise,
- I should think you would have to attach this first.
I'm aware of the slight difference in meaning from "I would think..." but had no idea that I myself would actually naturally use it. Is this an atavism or do other young people actually still use it, say in the US? (Young e.g. 30s and younger).