After being brought back from the dead, Victor found that his vocal chords were worn dry and, quite frankly, dead. It appeared that his voice did not awake the same moment he had, limiting the walking corpse to grunts and groans.
You were a big communicator, so having conversation between you and your friend was incredibly upsetting. However, no more! Frankenstein was open to being taught, and you appeared to be a decent teacher.
The biggest struggle was trying to get his voice to actually work...the poor man's throat felt as if it was tightened. In all fairness, it was probably filled to the brim with soil. This was surely an easy fix. He had kept sipping from a water bottle, a small groan escaping as he tried to form the words you were teaching him.