Have you experienced testing the voltage to ground for a delta ungrounded system?
Yes. While capacitance tends to make the system measure like a grounded-wye system, especially with a high-impedance meter, any appreciable load to ground on any line will readily bring that line close to 0.0v.
For corner grounded have you tried checking the voltage of neutral to ground? Please check
Again, yes. The "neutral" (intentionally-grounded conductor) of a corner-grounded system will measure and behave just like the neutral in any intentionally-grounded system.
Have you observe that when a current carrying conductor is grounded the voltage to ground is zero?
Well, at the location of the system bonding jumper, which effectively defines the service's or SDS's zero-voltage point, it will obviously measure 0.0v. As you work your way towards loads from there, when the grounded conductor must not be re-grounded, some voltage is likely.
Loading on the grounded conductor downstream from that bonding point will tend to cause voltage drop, which always raises the voltage to ground on a corner-grounded delta, and with imbalanced loading on systems where the grounded conductor is a genuine neutral.
If the line to ground voltage is zero do you have a probability of being electrocuted if you touch the grounded conductor or connected to earth?
Well, I believe you're using "electrocuted" to mean any shock. If you're measuring zero volts between two points, there is zero risk of shock, as no current can be made to flow. You can go outside and touch your electric meter while standing on the ground barefoot with no risk.