Below is the subject-verb agreement application.
Further Explanation
1. A singular subject must take a singular verb.
Example: A student is talking.
2. A plural subject must take a plural verb.
Example: The students are talking.
3. if two subjects are joined by the conjunction, 'and', the verb must be plural.
Example: Sam and Smith look weird today.
4. If a subordinate clause comes in-between the subject and the verb, the verb agreement must not change.
Example: The man, with his family, is coming home now.
5. Whenever a prepositional phrase comes in-between the subject and the verb, the verb must be plural.
Example: The colors of the rainbow are beautiful.
6. Whenever a sentence begins with 'there' or 'here,' the subject will always be placed after the verb.
Example: There is a little problem with the machine.
7. Subjects never precedes verb in questions.
Example: Why are these children disturbing you?
8. A singular verb must be used if the two subjects separated by "and" refer to the same person or thing as a whole.
Example: The president and commander-in-chief of the armed forces is visiting our state today.
9. If 'each, every, or no' comes before the subject, the right verb must be singular.
Example: Every man and woman is required to check-in.
10. If the subjects are both singular but are connected by "or," "nor,' neither/nor,' 'either/or,' or 'not only/but also,' the verb must be singular.
Example: Either Jessica or Christian is to blame.
11. Units of measurement or time take singular verb form.
Example: Four liters of oil were required to get the cooking running.
12. If the subjects are plural and are connected by and, the verb is plural.
Example: Mike and Jerry are studying in the room.
13. If  "or," "nor," "neither/nor," "either/or," or "not only/but also,"  connects two or more subjects and one of the subjects is plural, the subject nearest to the verb position determines the verb form.
Example: Either the bears or the lion is killed.
14. Indefinite pronouns typically take singular verbs with exceptions to the pronouns: few, many, several, both, and some.
Example: Everybody wants to be loved.
15. The indefinite pronouns: "few," "many," "several," "both," "all," and "some." These always take the plural verb form.
Example: Few were left alive after the flood.
16. Two infinitives separated by 'and,' must take the plural form of the verb.
Example: To play and study gum require a tactical skill.
17. Gerunds that are used as the subject of a sentence take the singular form of verbs. Â And when they are linked by 'and,' they must take the plural form.
Example: playing football and reading are my hobbies.
18. A collective noun, such as "team", 'fusillade,' 'staff,' can be either singular or plural depending upon the rest of the sentence. Typically, they take the singular form, as the collective noun is treated as a cohesive single unit.
Example: The herd is stampeding.
19. Â Title for Books, Movies, novels, and other similar works must be treated as singular which must take a singular verb.
Example: "Thieves of the high way", is a lovely novel to read.
20. If the percentage or a part of something is mentioned with plural meaning, a plural verb is used.
Example: 50 of every 100 children are malnourished in Ghana.
21. whenever a singular and plural subject is in a sentence before the verb, it is the subject close to the verb that must determine the form of verb---plural or singular. It is called the rule of proximity.
Example: The boys and Mike is awarded.
22. If two singular subjects are used alongside neither/nor, either/or, use the singular verb.
Example: Either Mary or Mike is sick.
23. When the plural subjects are joined by neither/nor, either/or, use the plural verb.
Example: Neither Mary nor her friends have gone home.
24. The singular verb must be used with non-countable nouns that come before an indefinite pronoun.
Example: All the water is colored.
25. Plural verbs must be used with a countable noun that is placed before an indefinite pronoun.
 Example: All the clothes are thrown on the floor.
26. When the inverted subject is used with a singular noun, use a singular verb.
Example: 'Why' is my 'hat' outside in the rain?
27. Designations of 'entities' like nations, compositions, titles of books, or films, must take a singular verb.
Example: The United Nations is headquartered in New York.
28. All pluralia tantum like: mathematics, physics, measles, pajamas, jeans, and scissors and all others that are singular in form and meaning must take a singular verb.
Example: The new pairs of jeans you saw on the bed, is mine.
29. Then Pluralia tantum like: tweezers, proceeds, goods, etc, must take a plural verb.
Example: The tweezers are on the field.
30. Whenever 'one of' or 'one of the' is used in a sentence, the singular verb must be used.
Examples:Â 'One of' us is not here today.
