If the subject in a clause is singular, the verb form should be singular, and if the subject is plural, the verb form should be plural. So far, so good. But what about subjects that coordinate two activities – which verb form should I use with those?
Examples:
Discussion and reflection is/are part of the course
Preparation for and participation in seminars is/are mandatory
Cooking your own food and then eating it is/are very satisfying
Strictly speaking, the subjects in these examples are plural, but I can't help feeling that the versions with a singular verb sound better than those with a plural verb. Is my gut wrong here, or am I right that the singular verb is preferable? And if so, how is this explained from a grammar point of view, seeing that the subjects are plural?