HESI A2 Grammar & Vocabulary Guide

The Grammar and Vocabulary & General Knowledge sections of the HESI A2 (Admission Assessment) exam reward steady preparation more than last-minute cramming. Both are highly learnable: grammar comes down to a finite set of rules you can drill, and vocabulary is mostly everyday and healthcare-related words you can build through consistent review. Many nursing programs require one or both sections as part of your composite score, so even a modest improvement here can lift your overall result. This guide breaks down what each section covers, the rules and word types that show up most, and a practical study routine to raise your score before test day.

How the Grammar and Vocabulary sections are structured

The HESI A2 is modular, and each school decides which sections to require — but Grammar and Vocabulary & General Knowledge are among the most commonly included. The general layout looks like this:

• The Grammar section typically has about 50 questions (including a few unscored pilot items you can’t identify) with roughly 50 minutes of testing time.
• The Vocabulary & General Knowledge section is similarly about 50 questions in around 50 minutes.
• Questions are multiple choice, and many are framed in health-related sentences, so the wording often feels relevant to nursing.

Always confirm your own program’s requirements — question counts, time limits, and which sections count toward your composite can vary slightly by version and by school.

Parts of speech you need to know

A large share of grammar questions hinge on recognizing how words function in a sentence. Make sure you can quickly identify each of these:

1. Nouns — people, places, things, or ideas, including the difference between common and proper nouns.
2. Pronouns — words that replace nouns (he, she, it, they, who, which), and how to match them to the right antecedent.
3. Verbs — action and linking words, plus correct tense and subject agreement.
4. Adjectives and adverbs — words that describe nouns versus words that describe verbs, adjectives, or other adverbs.
5. Prepositions and conjunctions — words that show relationships (in, on, between) and words that join ideas (and, but, because).

You won’t be asked to define these terms in a vacuum — you’ll need to apply them, such as choosing the pronoun or verb form that fits a sentence correctly.

The most common grammar rules tested

Most grammar questions cluster around a predictable set of rules. Drilling these gives you the best return on study time:

• Subject–verb agreement. A singular subject takes a singular verb (the nurse checks), and a plural subject takes a plural verb (the nurses check).
• Pronoun–antecedent agreement. A pronoun must match the noun it replaces in number and person — watch for unclear or mismatched references.
• Verb tense consistency. Keep tenses aligned within a sentence unless the meaning requires a shift.
• Commonly confused words. Know their/there/they’re, your/you’re, its/it’s, to/too/two, and affect/effect.
• Modifiers. Place describing words next to what they modify to avoid dangling or misplaced modifiers.

If you master agreement, tense, and the confused-word pairs, you’ll handle the majority of grammar items with confidence.

What the Vocabulary section actually tests

The Vocabulary & General Knowledge section checks your understanding of words you’ll encounter in school, in everyday life, and in healthcare settings. Expect questions that ask you to:

• Choose the correct meaning of a word as used in a sentence.
• Pick the word that best completes a sentence.
• Recognize healthcare-flavored terms — words like abstain, contraindication, dilate, flushed, lethargic, nutrient, or symptom that appear often in medical contexts.

These are not obscure terms — most are common words you may already half-know. The goal is to make that recognition fast and certain.

Using roots, prefixes, and context clues

When a word looks unfamiliar, two strategies will rescue most questions:

1. Break the word into parts. Many medical and academic words share roots and affixes. Knowing that hyper- means over or above, hypo- means under, -itis means inflammation, and -ology means the study of can help you decode meaning even when you’ve never seen the full word.
2. Read the whole sentence for context clues. Surrounding words often contain a synonym, a contrast, or an example that points you to the right meaning. Don’t choose an answer based on a word in isolation when the sentence tells you how it’s being used.

Combining word parts with context clues lets you make a strong, evidence-based guess instead of a random one.

Study strategies that build both skills

Grammar and vocabulary both improve with short, consistent practice rather than a single long session. These habits work well:

• Keep a running word list. Every time you meet a word you don’t know, jot it down with a short definition and review the list often.
• Use flashcards for confused-word pairs and high-frequency roots and prefixes.
• Do timed practice sets so you get used to roughly a minute per question and don’t stall on any single item.
• Read a little every day — articles, especially health-related ones — to absorb correct grammar and new vocabulary naturally.
• Review every miss and label the reason: a rule you forgot, a word you didn’t know, or a rushed read.

A simple 1-week prep plan

1. Days 1–2: Drill subject–verb and pronoun–antecedent agreement until they feel automatic.
2. Days 3–4: Review verb tense, modifiers, and the commonly confused word pairs.
3. Day 5: Build vocabulary — study high-frequency roots and prefixes and practice context-clue questions.
4. Day 6: Take a timed mixed set of grammar and vocabulary questions at the real one-minute-per-question pace.
5. Day 7: Review every miss, write down why you missed it, and re-drill the weakest area.

Because both sections rest on a finite set of rules and word patterns, a focused week of practice often produces a clear score gain.

Common mistakes that cost easy points

Most lost points come from avoidable habits, not impossible questions. Watch for these:

• Trusting your ear instead of the rule. A sentence can sound fine and still break agreement or tense — check the actual structure.
• Mixing up confused words like affect/effect or its/it’s under time pressure.
• Choosing a vocabulary answer from a single word instead of how it’s used in the full sentence.
• Ignoring word parts when a prefix or root would have unlocked the meaning.
• Rushing and misreading a question stem, then picking a close-but-wrong choice.

Reviewing why you missed each item teaches you more than the raw number you got right.

The bottom line

The HESI A2 Grammar and Vocabulary & General Knowledge sections each run about 50 questions in roughly 50 minutes and reward preparation over guessing. Grammar comes down to agreement, tense, modifiers, and the commonly confused word pairs; vocabulary is mostly everyday and healthcare words you can decode with roots, prefixes, and context clues. None of it requires memorizing obscure trivia — just steady, rule-based practice and a growing word list. Use the free HESI A2 practice questions below to test your grammar and vocabulary before exam day.