A sentence from Manhattan sentence correction for GMAT_ parallelism " not but " Dr. Crock's claims HAVE not BEEN CORROBORATED by other scientists or PUBLISHED in a prestigious journal but HAVE nonetheless GARNERED a great deal of attention from the public. -- A sentence from Manhattan sentence correction for GMAT. Not...but...is a parallel marker. Shouldn't " not " in front of " Have" ? To be parallel with but HAVE ? Dr. Crock's claims not HAVE BEEN CORROBORATED by other scientists or PUBLISHED in a prestigious journal but HAVE nonetheless GARNERED a great deal of attention from the public.