1) Neither the colour nor the shades have changed.

Solution

Rule  ⇒ If the subject is made up of both singular and plural words connected by or, nor, either …. Or, neither … nor, not only … but also, the verb agrees with the nearer part of the subject. In the sentences of the type: “Neither _____ nor _____” OR “Either _________ or ______” The verb always takes the form of the subject closest to it. That is, in sentence “Neither A nor B …… (verb)”, the verb will take the form in relation to B because B is closer to it and A will be ignored. So if B is plural, verb will be plural (e.g. have) and if B is singular, verb will be singular (e.g. has).