Confused a little is verb correct in following sentence?

Not only the newspaper, but also the radio warns of the approaching crisis.

2 answers

Yes, the verb is correct, but be sure to put a comma after "radio" for complete correctness.
http://grammar.ccc.commnet.edu/grammar/commas.htm
Scroll down and see #4.

Also this:
http://grammar.ccc.commnet.edu/grammar/conjunctions.htm#correlative_conjunctions