Subject-verb agreement is when a singular noun has an accompanying singular verb, and a plural noun has an accompanying plural verb.Here are 10 basic rules of subject verb agreement.
Two singular subjects connected by ‘or’ or ‘nor’ require a singular verb.
Example-My friend or my cousin is coming to London today.
Two singular subjects that are connected by ‘either or’ or ‘neither nor’ needs a singular verb.
Example-Neither Josephine nor Felix is free today.
Example-Either Bob or Jenny helps today with the party decorations.
When one of your two subjects is ‘I’, put ‘I’ second and follow it with the singular verb ‘am’ .
Example-I am sleeping late tonight.
Example-I am Katherine.
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 newspaper or the book are on the shelf.
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 Jacob nor the others are available.
Use a plural verb with two or more subject when they are connected by ‘and’
Example-A dog and a cat is all I ever wanted.
Pronouns such as ;everyone,anybody,each,someone,etc are singular and require singular verbs.
Example-Each of the boys deserve a prize.
Example-Every one of boys deserve a prize.
Look at the noun in your phrase to identify a singular or plural verb.
a)Eighty percent of the pizza has disappeared.
b)Fifty percent of the pizzas have disappeared..
c)Some of the pizza is missing.
d)Some of the pizzas are missing.
Always take singular verbs when either and neither are subjects.
Example-Neither of them is coming to the party.
Collective nouns such as colony may be either singular or plural depending on your usage in the sentence.
Example-The colony of soldiers are going for war soon.