I was wondering if the green sheet rock will do just as well as cement board for installing in a show that I'm planning on tiling?

I was wondering if the green sheet rock will do just as well as cement board for installing in a show that I'm planning on tiling?
Cement board is the best choice. Green board will swell if not installed correctly and cause problems. All things considered, material is cheap. Labor is a big expense to install and then replace 5 yrs down the road.

Nope there no substitute for cement board where water will make contact, the water will go through the grout and in time damage the sheetrock then rott the studs.
Green board is not water proof, its just mildrew restistant

Great answers guys! I renovate houses and I can't tell you how many times I've pulled down old shower tile just to have to rebuild the whole wall (or at minimum, the studs) behind it because they used greenboard instead of Durock or equal. I'm a girl, so I go around and around with builders and contractors about this. They think I don't know what I'm talking about. They insist that greenboard is fine. My response... they're not the ones pulling it out down the road.