The verb "do" often serves a meaningless purpose in questions. John McWhorter argues in his book "Our Magnificent Bastard Tongue" that this is a direct influence of the Celtic languages. In all of my studies of linguistics and philology I have never before seen anything concerning this hypothesis. Is this a widely accepted theory? If so, who are some other proponents? If not, what are other theories about the origin of the meaningless "do?"
Example of meaningless "do." Do we need to go to the store?
In most languages, this phrase would roughly be stated as... Need we go to the store?
Thank you in advance for your answers.