I was writing a message to someone who judged my grammar and I apologized and made it clear that English is not my native tongue. My apology went a little like this:
I do apologize if my English has confused you in any way. I did believe I had considerably understandable English.
He simply responded by saying I do not because "considerably" means "large amount" and that I used the word incorrectly in the sentence. Did my sentence really not make sense?