I know it's wrong, but I do it all the time or else my sentences would go on forever.
I read a few things someone wrote and for the first time I saw a sentence starting with "in which case". This person does that very frequently, and it seemed really wrong to me. Some time after that ...
I have heard that starting a sentence with however is wrong. What are the grounds for this view and is it still held by a majority of pedants? They would suggest changing However, some people are ...