This is an ER verb. Using the subject, we would add <em>o </em>to the end of the converted verb.
because this is talking in the <em>I </em>subject, we also add a g.
The final answer will then be <em>hago</em>.
Another example of this is using Tener. When converted to the <em>yo</em> subject, you get tengo. This is used With certain verbs, these being 2 of the many.