Even though grammar can be a little weird from time to time, there are 20 rules of the subject-verb agreement that summarize the topic quite concisely. Most concepts of subject-verb concordance are simple, but exceptions to the rules can make things more complicated. Normally, it doesn`t say “a book is on the table” or “a pencil is on the table.” Since you have not made a list of nouns or plural nouns, the verb must remain singular. 17. If gerunds are used as the subject of a sentence, they take the singular form of the verb. However, when linked by “and”, they take the plural form. 7. The verb is singular when the two separate subjects refer to the same person or the same thing as a whole. 14. Indeterminate pronouns generally accept singular verbs (with a few exceptions).
If you have two singular words that are by or connected….