[terranearth]

Hi everyone! I'm a college student learning Japanese at the freshman college level. I have about a year's experience with Japanese, and I've joined this forum primarily as a means of improving my Japanese by conversing with native speakers. I just have a couple of preliminary questions I'd like to ask:

1. How would you say "don't waste my time" or "this is a waste of time" in idiomatic Japanese?

2. How would you say something like "X is so Y that Z"? For example, "I'm so hungry I could eat a horse!"

3. Also, when someone says 皆で行きましょ or the equivalent, what use of "de" is this? Is it the copula de used to link sentences? In that case is the "de" used in それで良い　to express the next best alternative (I think) the same copula usage?

Thanks!