Why do liquid conducts electricity?

Answer 1

1. the liquid could be a metal such as Mercury or gallium.
2. the liquid could be a polar solvent such as water and contain ions
3. any surface whether it be a solid or a liquid will conduct an AC current.
4. 
   

Answer 2

Not all liquid does. Pure water does not conduct electicity.

Answer 3

Liquid conduct Electricity due to the presence of ions in liquid or due to the ability of liquid molecules to split in ions.