Combines nominalization -기 with particle 도 (also/too) and 하다. Used to say "also does" or list multiple actions. Can emphasize that an action is unexpected or additional.

• •Additional action: "운동도 하고 공부도 해요" (I exercise and also study)
• •Unexpected: "울기도 해요" (S/he even cries)
• •One of many: "춥기도 하고 덥기도 해요" (It's both cold and hot)