Agreement: The subject of a sentence must agree with the verb and pronouns must agree with their antecedents. The following are guided lessons to help you review this important grammar lesson.

Subject- Verb Agreement

Power Point Review
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What is Subject-- Verb Agreement? (The following is adapted from the Purdue Owl.)
1. When the subject of a sentence is composed of two or more nouns or pronouns connected by and, use a plural verb.
She and her friends are at the fair.
2. When two or more singular nouns or pronouns are connected by or or nor, use a singular verb.
The book or the pen is in the drawer.
3. When a compound subject contains both a singular and a plural noun or pronoun joined by or or nor, the verb should agree with the part of the subject that is nearer the verb.
The boy or his friends run every day.His friends or the boy runs every day.
4. Doesn't is a contraction of does not and should be used only with a singular subject. Don't is a contraction of do not and should be used only with a plural subject. The exception to this rule appears in the case of the first person and second person pronouns I and you. With these pronouns, the contraction don't should be used.
He doesn't like it.They don't like it.
5. Do not be misled by a phrase that comes between the subject and the verb. The verb agrees with the subject, not with a noun or pronoun in the phrase.
One of the boxes is openThe people who listen to that music are few.The team captain, as well as his players, is anxious.The book, including all the chapters in the first section, is boring.The woman with all the dogs walks down my street.
6. The words each, each one, either, neither, everyone, everybody, anybody, anyone, nobody, somebody, someone, and no one are singular and require a singular verb.
Each of these hot dogs is juicy.Everybody knows Mr. Jones.Either is correct.
7. Nouns such as civics, mathematics, dollars, measles, and news require singular verbs.
The news is on at six.
Note: the word dollars is a special case. When talking about an amount of money, it requires a singular verb, but when referring to the dollars themselves, a plural verb is required.
Five dollars is a lot of money.Dollars are often used instead of rubles in Russia.
8. Nouns such as scissors, tweezers, trousers, and shears require plural verbs. (There are two parts to these things.)
These scissors are dull.Those trousers are made of wool.
9. In sentences beginning with there is or there are, the subject follows the verb. Since there is not the subject, the verb agrees with what follows.
There are many questions.There is a question.
10. Collective nouns are words that imply more than one person but that are considered singular and take a singular verb, such as: group, team, committee, class, and family.
The team runs during practice.The committee decides how to proceed.The family has a long history.My family has never been able to agree.
In some cases in American English, a sentence may call for the use of a plural verb when using a collective noun.
The crew are preparing to dock the ship.
This sentence is referring to the individual efforts of each crew member. The Gregg Reference Manual provides excellent explanations of subject-verb agreement (section 10: 1001).
11. Expressions such as with, together with, including, accompanied by, in addition to, or as well do not change the number of the subject. If the subject is singular, the verb is too.
The President, accompanied by his wife, is traveling to India.All of the books, including yours, are in that box.
Purdue Owl Advanced Information

Pronoun- Antecedent Agreement

What is pronoun-antecedent agreement? (As adapted from the Purdue Owl.)
Because a pronoun REFERS BACK to a noun or TAKES THE PLACE OF that noun, you have to use the correct pronoun so that your reader clearly understands which noun your pronoun is referring to.
Therefore, pronouns should:
1. Agree in number
If the pronoun takes the place of a singular noun, you have to use a singular pronoun.
If a student parks a car on campus, he or she has to buy a parking sticker.(NOT: If a student parks a car on campus, they have to buy a parking sticker.)
Remember: the words everybody, anybody, anyone, each, neither, nobody, someone, a person, etc. are singular and take singular pronouns.
Everybody ought to do his or her best. (NOT: their best)Neither of the girls brought her umbrella. (NOT: their umbrellas)
NOTE: Many people find the construction "his or her" wordy, so if it is possible to use a plural noun as your antecedent so that you can use "they" as your pronoun, it may be wise to do so. If you do use a singular noun and the context makes the gender clear, then it is permissible to use just "his" or "her" rather than "his or her."
2. Agree in person
If you are writing in the "first person" ( I), don't confuse your reader by switching to the "second person" ( you) or "third person" (he, she, they, it, etc.). Similarly, if you are using the "second person," don't switch to "first" or "third."
When a person comes to class, he or she should have his or her homework ready.(NOT: When a person comes to class, you should have your homework ready.)
3. Refer clearly to a specific noun.
Don't be vague or ambiguous.
NOT: Although the motorcycle hit the tree, it was not damaged. (Is "it" the motorcycle or the tree?)NOT: I don't think they should show violence on TV. (Who are "they"?)NOT: Vacation is coming soon, which is nice. (What is nice, the vacation or the fact that it is coming soon?)NOT: George worked in a national forest last summer. This may be his life's work. (What word does "this" refer to?)NOT: If you put this sheet in your notebook, you can refer to it. (What does "it" refer to, the sheet or your notebook?)