Rule 1. Two singular subjects connected by or or nor require a singular verb.
Example: My aunt or my uncle is arriving by train today.
Rule 2. Two singular subjects connected by either/or or neither/nor require a singular verb as in Rule 1.
Examples: Neither Juan nor Carmen is available.
Either Kiana or Casey is helping today with stage decorations.
Rule 3. When I is one of the two subjects connected by either/or or neither/nor, put it second and follow it with the singular verb am.
Example: Neither she nor I am going to the festival.
Rule 4. When a singular subject is connected by or or nor to a plural subject, put the plural subject last and use a plural verb.
Example: The serving bowl or the plates go on that shelf.
Rule 5. When a singular and plural subject are connected by either/or or neither/nor, put the plural subject last and use a plural verb.
Example: Neither Jenny nor the others are available.
Rule 6. As a general rule, use a plural verb with two or more subjects when they are connected by and.
Example: A car and a bike are my means of transportation.
Rule 7. Sometimes the subject is separated from the verb by words such as along with, as well as, besides, or not. Ignore these expressions when determining whether to use a singular or plural verb.
Examples: The politician, along with the newsmen, is expected shortly.
Excitement, as well as nervousness, is the cause
of her shaking.
Rule 8. The pronouns each, everyone, every one, everybody, anyone, anybody, someone, and somebody are singular and require singular verbs. Do not be misled by what follows of.
Examples: Each of the girls sings well.
Every one of the cakes is gone.
NOTE: Everyone is one word when it means everybody. Every one is two words when the meaning is each one.
With words that indicate portions—percent, fraction, part, majority, some, all, none, remainder, and so forth —look at the noun in your of phrase (object of the preposition) to determine whether to use a singular or plural verb. If the object of the preposition is singular, use a singular verb. If the object of the preposition is plural, use a plural verb.
Examples: Fifty percent of the pie has disappeared.
Pie is the object of the preposition of.
Fifty percent of the pies have disappeared.
Pies is the object of the preposition.
One-third of the city is unemployed.
One-third of the people are unemployed.
NOTE: Hyphenate all spelled-out fractions.
All of the pie is gone.
All of the pies are gone.
Some of the pie is missing.
Some of the pies are missing.
None of the garbage was picked up.
None of the sentences were punctuated correctly.
Of all her books, none have sold as well as the first one.