Possible Duplicate:
Using “do” or “does” for two things connected by “and”?
I'm writing an interrogative sentence questioning someone else's writing:
"Is grammar and spelling correct?"
Can I use the singular verb "is" or must it be the plural verb "are"?
(The sentence is one of a list of interrogative questions about the quality of writing, e.g. "Are words in the right order?" "Does the copy flow?")