It is appropriate to break the rule that requires subjects joined by and to use a plural verb when: the two subjects separated by and refer to the same person or thing. Examples are: Peanut butter and jelly is my favorite sandwich. Red beans and rice is my mom's favorite dish.
it is appropriate to break the rule that requires subjects joined by and to use a plural verb when either and neither are subjects. They always take singular verb.
For example :
Either of us is capable of doing the job
8.6m questions
11.2m answers