The word "ain't" is in the dictionary, but does that mean it's OK to use? Grammar Girl is here to let you know - Quick and Dirty Tips.
there's correct and correct. Grammatically correct "It is I" sounds stilted most of the time. I knock on Mom's door, she shouts to see who it is (cause it might not be worth climbing out of the easy chair for just anybody), I shout back "It's me." Call my brother on the ...