Measles still afflict many people. Check every verb to be sure it matches the subject. This is a rule of thumb only and will NOT apply a great number of irregular and collective nouns or irregular verbs. Inside the house are many a weirdo. The Simpsons Is my favorite TV show.
Measles still afflicts many people.
The jury are still arguing. Several andiew are always plural. Everyone has their homework. Every pronoun must agree with its antecedent. In some cases, this may be tough, as the pronoun and its antecedent may be far from each other, or there may be a collective or indefinite noun as an antecedent.