Can someone diagram this sentence:
I thought it was best to let you decide to whom this needs forwarded.
In addition, is the sentence grammatically correct? If not, why?
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I’m not sure diagramming is possible on Stack Exchange, even if anyone wanted to do it. The sentence is grammatical, except for the last word. British English, at least, would require to be forwarded.
For the grammaticality of this statement, it uses the "needs washed" construction, regional in the U.S. to central Pennsylvania and environs, and which has been discussed here in these three questions. If you're not in a region where this construction is used, you should say "needs to be forwarded". As for how to diagram "needs forwarded", since it's not a standard construct, I don't know whether there's a standard way of doing it.