Take for example, if you were doing SEO for "plumber new york". Is it better to do on-page optimization with the grammatically correct "plumber in new york"?
A lot of SEO tools I know of do not factor in determiners when analyzing the SEO of a page thinking your keyword "plumber new york" is not in your title tag if you write "plumber in new york". From a user stand-point (and hence likely Google's point of view), it makes sense to optimize for the more human-form "plumber in new york" which should therefore perform better for the search term "plumber new york".
Thoughts on this issue? Any good articles or case studies?