5.2 Verb Tenses

The English Tense System on STEP

English organizes verb tenses along two axes: time (present, past, future) and aspect (simple, continuous, perfect). STEP's Grammar/Structure section draws on all nine combinations of these two axes, so a systematic understanding of the full grid — not just memorized examples — is the most reliable preparation.

• Simple aspect states a fact, habit, single completed action, or scheduled future event, without emphasizing duration or completion relative to another time.
• Continuous (progressive) aspect emphasizes that an action is, was, or will be in progress at a particular moment or during a particular period.
• Perfect aspect emphasizes that an action is completed relative to another point in time — the present moment, a past moment, or a future moment.

Tense Reference Table

A tenth combination, the perfect continuous (has been testing, had been testing, will have been testing), appears less frequently on STEP but follows the same logic: it combines the perfect aspect's completion-relative-to-another-time meaning with the continuous aspect's emphasis on ongoing duration, so a sentence like She has been studying English for six years stresses the ongoing span of an action that continues into the present.

Why Irregular Verbs Are a Classic Trap

Regular verbs form both their past simple and past participle the same way, by adding -ed (walk → walked → walked). Irregular verbs frequently use three different forms — base, past simple, and past participle — and STEP exploits the fact that many test-takers confuse the past simple form with the past participle form, especially when a perfect tense is required.

The trap: a sentence requiring the present perfect or past perfect (has ___, had ___) needs the past participle, not the past simple form. A sentence like She has went to the conference is incorrect; the correct form is She has gone to the conference. Because the past simple form (went) is often more familiar and sounds equally fluent in casual speech, it is the distractor most test-takers reach for by instinct — which is exactly why STEP includes it as a wrong answer choice.

Common Tense-Mixing Errors

Two mixing errors show up repeatedly in STEP-style items:

1. Mixing past-simple narrative with present perfect. When a sentence is anchored to a specific, completed past time (signaled by words like yesterday, in 2015, or last year), the verb must be past simple, not present perfect. A sentence like Yesterday, she has finished the report is incorrect because yesterday fixes a specific past time, which is incompatible with the present perfect's unspecified-time-connected-to-now meaning. The correct form is the past simple: Yesterday, she finished the report.
2. Failing to mark an earlier past action with the past perfect. When a sentence describes two past actions that happened at different times, the action that happened first should usually be marked with the past perfect, while the later action stays in the past simple: By the time the ambulance arrived, the patient had already recovered consciousness. Using past simple for both actions can blur which action came first, which is exactly the ambiguity STEP's by the time and before/after items are built to test.

Applying the Rules

When you meet a tense-based blank on STEP, first locate the sentence's time-signal words (since, for, yesterday, by the time, next year, already) and any second verb that establishes a sequence of events, then match the required tense to that signal before checking whether the verb form itself, regular or irregular, is correctly spelled.