Hello, fellas. In this session we will learn some irregularities in subject-verb agreement.
Sometimes a proper noun (the name of a particular person, place, or object spelled with a capital letter) that ends in –s is followed by a singular verb because it is singular. The singular pronoun it is used if the noun is changed to a pronoun.
The United Nations has 193 member states.
News is a singular noun.
Bad news is good news.
Fields of study ending in –ics are followed by singular verbs.
Economics is interesting.
Several illnesses which end in –s require singular verbs, such as diabetes, measles, mumps, rabies, rickets, shingles.
Measles is an infectious disease producing small, red spots all over the body.
Expressions of time, money, and distance are usually followed by a singular verb.
Five dollars is enough to pay.
Arithmetic expressions require singular verbs.
One and three equals four.
Betty Schrampfer Azar, Understanding and Using English Grammar: Third Edition
Cambridge Advanced Learner’s Dictionary: 4th Edition