5.1 Grammar Section Format & Question Types

Section Weight and Format

On the STEP English test, the Grammar (Sentence Structure) section contributes 30 of the exam's 100 scored questions, making it worth 30% of your total score — the second-heaviest section after Reading Comprehension (40%) and well ahead of Listening (20%) and Compositional Analysis (10%). Because Reading and Grammar together account for 70% of the score, strong grammar accuracy has an outsized effect on your final result.

Each Grammar/Structure item follows one of two closely related formats:

1. Fill-in-the-blank items. You are given a complete sentence with one word or short phrase removed and replaced by a blank. Four answer choices are provided, and you select the option that correctly completes the sentence. Some blanks require a single word (a verb form, a preposition, a connector); others require a short two-part phrase, such as a modal plus a main verb, or two verbs joined by a slash, as in had / started.
2. Error-identification items. You are given a complete, already-formed sentence in which one segment has been marked off — often labeled A, B, C, and D — alongside three other segments that are grammatically sound. Four choices correspond to these segments, and you select the one that contains the error.

In both formats, exactly four answer choices are presented and only one is correct. There is no partial credit, so an educated guess always beats leaving an item blank.

Read for Meaning Before You Analyze Grammar

The single most important test-taking habit for this section is to read the entire sentence for its meaning and logic before evaluating the four answer choices. STEP's grammar items are deliberately constructed so that more than one answer choice may be grammatically well-formed in isolation. What separates the correct answer from the grammar-trap distractors is whether the choice also produces a sentence that makes logical sense given the timeline, cause-and-effect relationship, or contrast signaled elsewhere in the sentence.

Consider a sentence built around the signal phrase by the time. Several verb-tense options might each be valid English in a different context — had finished, have finished, and finished are all grammatical tenses somewhere — but only one of them correctly represents an action completed before another past event. Jumping straight to each option's grammar without first noticing that by the time plus a past-tense clause demands a past perfect verb in the other clause makes it easy to fall for a distractor that sounds fine read on its own.

The same principle applies beyond verb tenses. A blank calling for a verb of action might offer four choices that are all grammatically identical in form — all bare infinitives, all past participles, all gerunds — but differ in meaning, and only one produces a sentence that is logically coherent given the situation described.

A Practical Four-Step Approach

Apply this sequence to every Grammar/Structure item:

1. Read the whole sentence first, ignoring the blank or marked segment. Identify the overall situation: what happened, in what order, and what relationship connects the clauses (time, cause, contrast, condition).
2. Identify what grammatical slot is being tested — a verb tense, subject-verb agreement, a preposition after a fixed expression, and so on. Naming the category narrows your focus.
3. Eliminate any choice that is flatly ungrammatical — wrong verb form, subject-verb mismatch, wrong part of speech.
4. Among the grammatically possible survivors, choose the one that matches the logic established by the sentence's time markers, connectors, or cause-and-effect signals, such as since, by the time, although, or so...that.

Worked example. Consider a sentence describing a company's history: The startup had struggled financially for two years, so when investors finally offered funding, the founders ______ almost given up. A rushed test-taker might scan the four choices — have, had, has, were — purely for whichever sounds natural before almost given up. Reading the full sentence first reveals the real logic: the founders' near-decision to give up happened before the investors' offer, which is itself already a past event. That calls for the past perfect, had, to mark an action completed earlier than another past action. Grammar alone does not resolve the choice — the timeline does.

Because this section has 30 items within a fixed slice of the roughly 2.5-hour testing time, aim to spend well under a minute on most questions so you have time remaining for Reading Comprehension, which carries even more weight.

What This Study Guide Covers

This guide splits STEP's Grammar/Structure content into two chapters so each topic gets focused treatment. The table below previews both.

Master the tense, agreement, and conditional rules in this chapter first — they appear across the largest share of Grammar/Structure items and also underpin correct comprehension in the Reading and Listening sections, since misreading a verb tense can distort your understanding of a passage's timeline.