Do not mistake the of phrase as the subject.
Make the verb agree with he subject, not with the of phrase.
1. Sentences in the inverted order where the subject is not in the beginning position, but comes after the verb must be properly identified.
2. On compound subjects:
a). Generally, compound subjects connected by and takes the simple form of the verb.
b). Compound subjects that refer to the same person or thing take the s-form of the verb.
c). A compound subject involving the use of each and every requires the s-form of the verb.
d). Compound subjects joined by or, either… nor, not only… but also, agree with the nearer subject
3. a). Nouns ending in –s but singular in meaning, such as physics, economics, mathematics, measles, civics and news take the s- form of the verb.
b). some nouns are plural in form and plural in meaning. These nouns take the simple form of the verb: scissors, tongs, shears, pliers, pants, tweezers.
4. Fraction, periods of time, weights and amount of money
a). Fractions may take the simple form or the s- form of the verb depending on the of- phrase. If the object of the preposition of is singular, the fraction takes the s- form of the verb, if it is plural; the verb takes the simple form.
b). Words or phrases that express periods of time, weights, measurements and amounts of money or taken as a unit are take the s- form of the verb.
c). Expressions of quantity or amount that describe individual items rather than whole unit require the simple verbs.
5. Adjectives used as subjects take the simple form of the verbs.
7. Indefinite pronouns like everyone, anyone, someone, somebody, or one, each one, everybody, all (meaning everything), neither and either take the s- form of the verbs.
8. Subjects modified by each, every, neither and either take the s-form of the verbs.