I often hear people use the abbreviation 'i.e.' while speaking. It does not seem right to me. Similarly with 'e.g.' — I would always say 'for example' rather than 'e.g.'.
So is it appropriate to use 'i.e.' (or more generally, abbreviations) in speech?
I have seen "i.e." and "e.g" used in writing (legal writing especially), but I have never heard anyone use these terms while speaking. Frankly, it seems a bit awkward to do so. I have heard people use the terms "that is" and "for example" in speech.