3 Core Grammar and Usage
Learn how agreement, tense, pronoun use, modifier placement, and parallel structure make sentences clearer and easier to follow.
A verb agrees with its subject in number: a singular subject takes a singular verb, and a plural subject takes a plural verb. First identify the subject and its verb; do not let nearby words distract you.
Singular: The list of supplies is on the desk. The subject is “list”; “of supplies” is an intervening phrase.
Plural: The supplies on the list are on the desk.
A compound subject joined by “and” is usually plural: “Maya and Luis work together.” With “or” or “nor,” the verb usually agrees with the nearer subject: “Either the coach or the players are arriving first.”
Indefinite pronouns such as “everyone,” “each,” and “someone” are usually singular in standard usage: “Everyone has a ticket.” In a later reference to a person whose gender is unknown or not specified, singular “they” is widely used: “Everyone should bring their ticket.”
Consistent
indicates when an action or condition occurs. Keep tense consistent when actions happen in the same time frame, but change tense when the time changes.
Inconsistent: “We walked to the park and eat lunch there.”
Consistent past: “We walked to the park and ate lunch there.”
Logical change in time: “We walked to the park and will return tomorrow.”
A tense shift is not automatically an error. In “Nora finished the report and now checks the figures,” “finished” describes a completed past action and “checks” describes what she does now. Make sure time words such as “yesterday,” “since,” and “tomorrow” agree with the verb forms you choose.
Pronouns and clear reference
A replaces or refers to a noun called its . Pronouns should agree with their antecedents, refer clearly to them, and fit their grammatical role.
Agreement and clear reference
“The students submitted their forms” uses a that agrees with its . Singular “they” is also used in “A student may ask their instructor for help.”
A reference can be unclear when more than one noun could be meant. In “When Ava spoke to Mei, she looked worried,” it is unclear who “she” refers to. “Ava looked worried when she spoke to Mei” makes the reference clearer. Rewrite a sentence if a could refer to more than one noun, or if its is missing or vague. For example, replace “This was surprising” with a more specific reference such as “The sudden cancellation was surprising.”
Use subject forms (“I,” “he,” “she,” “we,” “they”) for subjects and object forms (“me,” “him,” “her,” “us,” “them”) for objects. For example, write “Jordan and I finished the task” and “The instructor thanked Jordan and me.”
To check the form, remove the other person’s name: “I finished the task,” not “Me finished”; “The instructor thanked me,” not “thanked I.”
placement
A is a word or phrase that describes or limits another part of a sentence. Place it close to what it modifies so readers can tell what it describes.
Misplaced: “She served sandwiches to the children on paper plates.” The wording may suggest that the children were on the plates.
Clear: “She served the children sandwiches on paper plates.”
An introductory phrase that describes an action should be followed by the person or thing performing that action. Otherwise, the may dangle.
Dangling: “Walking to school, the rain began to fall.” The sentence makes “the rain” seem to be walking.
Revised: “Walking to school, I felt the rain begin to fall.”
When a could logically describe more than one thing, rewrite the sentence to make the intended meaning unmistakable.
Use the same grammatical form for ideas of equal importance, especially in lists, comparisons, and constructions joined by “and,” “or,” or “but.” makes the relationships between ideas easier to follow.
Not parallel: “The job requires careful planning, to communicate clearly, and patience.”
Parallel: “The job requires careful planning, clear communication, and patience.”
Keep paired constructions balanced as well:
Not parallel: “She enjoys both reading novels and to write stories.”
Parallel: “She enjoys both reading novels and writing stories.”
Check each item in a series. If the first item is a noun, use comparable nouns; if it is a verb phrase, use comparable verb phrases.
A practical editing routine
When editing a sentence, check each of these points:
Does each subject agree with its verb?
Do the verb tenses match the intended time sequence?
Does each agree with and clearly refer to its ? Is its case correct?
Is each next to the word or action it describes, with its doer clearly named?
Are items in lists and paired constructions grammatically parallel?
These checks help keep sentence meaning clear: identify subjects before checking verb agreement, keep tense consistent unless the timeline changes, give pronouns clear and matching antecedents with correct case, place modifiers logically, and express equal ideas in parallel forms.