I am not trying to say I am a better grammarian than most people, but one of the grammatical errors that bothers me the most is the use of me or I incorrectly... and yet, I see people that I feel should know better do it all the time.
The way my mother, who taught English in Cuba as a second language, always explained it was to put myself into the sentence and test which felt right.
Jimmy gave an orange to Sandra and I.
Would Jimmy give I an orange?
Jimmy gave ME an orange so consequently the correct sentence would be:
Jimmy gave Sandra and me an orange.
Here is the reverse:
Jimmy and me went to the movies
Would me go to the movies?
I went to the movies ergo Jimmy and I went to the movies.
I have even noticed it showing up in published books. How can editors miss it? It's so simple and yet seems to be so difficult for so many people!
What incorrect forms of speech bother you the most?