Verified answer

이거 is 'this is it' or referring to something

이게 could be 'this is what'

이거로 could be 'this is as'

I don't know if it is fully correct because I'm still studying lmao

If you are studying korean use talktomeinkorean.com it's very useful. (If you aren't already using it)

The first two are this is and that last one is this one

Igeo=it

Igeh=this is

Igeoro=this as