The Tense System

Lesson 5: The Past Continuous Tense

Lesson: 5 of 14 | Level: 🟢 Elementary — 🩵 Pre-Intermediate

1. Lesson Overview

The past continuous tense — sometimes called the past progressive — is the tense of actions in progress at a specific moment in the past. While the simple past presents a completed action as a whole — a single, finished event — the past continuous zooms in on the internal duration of a past action, presenting it as ongoing, unfolding, and not yet complete at a particular past moment.

The past continuous is most commonly encountered in narrative — where it provides the background against which completed events take place — but it has a range of other uses that extend well beyond simple storytelling. This lesson examines all of them in full, with particular attention to the interaction between the past continuous and the simple past in narrative writing.

Objectives

By the end of this lesson, you will be able to:

• Form the past continuous tense correctly in affirmative, negative, and question forms
• Identify and apply the main uses of the past continuous tense
• Understand the interaction between the past continuous and the simple past in narrative
• Recognise and correct common errors in the use of the past continuous tense

2. Core Content

A. Forming the Past Continuous Tense

The past continuous is formed with the past tense of be (was or were) + the present participle of the main verb (base form + -ing).

Affirmative form

Negative form

The negative is formed with was not (wasn’t) or were not (weren’t) + present participle.

For example:

The monitoring equipment was not functioning correctly during the critical phase of the experiment. The early climate models were not accounting for the full range of feedback mechanisms now known to affect temperature.

Question form

Questions are formed by inverting the subject and was or were.

For example:

Was the team collecting samples when the seismic event was recorded? Were scientists already studying hydrothermal vents before the 1977 discovery?

B. The Main Uses of the Past Continuous Tense

1. An action in progress at a specific moment in the past

The past continuous describes an action that was in progress at a specific, identifiable moment in the past. The action had already begun before that moment and had not yet finished at that moment.

For example:

At six o’clock on the morning of the discovery, the research team was descending to the ocean floor in the submersible. In 1977, when the hydrothermal vents were first observed, scientists were still working with the assumption that life could not exist without sunlight.

In the first sentence, the action of descending was in progress at a specific time — six o’clock. In the second, the assumption was in place — ongoing — at the moment of the discovery.

2. A background action interrupted by a shorter completed action

The most common use of the past continuous in narrative is to describe a background action — an ongoing activity — that was in progress when a shorter, completed event occurred. The completed event is expressed in the simple past; the background action is expressed in the past continuous.

For example:

The research team was collecting samples from the ocean floor when the submersible’s cameras suddenly revealed a previously unknown ecosystem. Darwin was studying the specimens he had collected on the Galápagos Islands when he began to notice the subtle but significant differences between the finches of different islands.

In both sentences, the past continuous establishes the background — what was in progress — and the simple past introduces the event that occurred during that background.

3. Two simultaneous background actions

The past continuous is used to describe two or more actions that were happening at the same time in the past — running parallel to each other simultaneously.

For example:

While the divers were collecting samples from the vent field, the surface team was monitoring their progress and recording the data in real time. As the glacier was retreating northward, the exposed rock was being colonised by pioneering plant species for the first time in thousands of years.

In both sentences, while and as introduce the parallel actions — both ongoing simultaneously in the past.

4. Setting the scene in narrative

The past continuous is used at the opening of a narrative or the beginning of a new section to establish the scene — to describe what was happening when the story begins, creating a sense of ongoing activity into which the main events will be introduced.

For example:

It was December 1831. A young naturalist named Charles Darwin was preparing for the longest and most consequential journey of his life. The year was 1977. A research vessel was cruising slowly over the floor of the Pacific Ocean, its instruments probing the darkness below.

In both passages, the past continuous creates a vivid, ongoing backdrop — the scene is set and the reader is placed in the middle of an unfolding situation before the main events begin.

5. Gradual or developing past situations

The past continuous describes situations that were gradually developing or changing at a point in the past — trends and processes that were underway.

For example:

By the middle of the 20th century, global temperatures were already beginning to rise at a rate that would accelerate dramatically in the decades that followed. At the time of Wegener’s death in 1930, the scientific community was still rejecting his theory of continental drift, despite the mounting evidence in its favour.

6. Repeated or habitual past actions with an emotional charge

The past continuous — used with always, constantly, and continually — describes repeated past actions that the speaker found annoying, surprising, or remarkable. This mirrors the equivalent use of the present continuous for current repeated actions.

For example:

The equipment was constantly malfunctioning during the most critical phases of the deep-sea survey. The committee was always requesting additional data without providing the resources needed to collect it.

7. Polite and indirect past requests

The past continuous — particularly with wonder and hope — is used in formal and polite contexts to make past requests and enquiries more tentative and less direct.

For example:

I was wondering whether the committee had yet reached a decision on the research funding application. We were hoping that the expedition might be extended by a further two weeks to allow for additional sampling.

8. Background context in academic and scientific writing

The past continuous is used in academic writing to describe the state of knowledge, the prevailing assumptions, or the ongoing work in a field at the time when a discovery or development occurred.

For example:

When Watson and Crick published their model of DNA in 1953, scientists were working with only a partial understanding of how genetic information was encoded and transmitted. At the time of the first deep-sea survey of the Mariana Trench, researchers were expecting to find relatively little life at such extreme depths.

9. Actions that were in progress but did not reach completion

The past continuous can imply that an action was in progress but was not completed — often because it was interrupted or because the circumstances changed.

For example:

The team was preparing to deploy the second submersible when the weather deteriorated beyond safe operating limits. Scientists were developing a promising new method for carbon capture when the funding for the project was unexpectedly withdrawn.

In both sentences, the past continuous implies that the action did not reach its intended conclusion — it was interrupted or prevented.

10. Expressing parallel developments in history or science

The past continuous is used to describe two or more developments that were occurring simultaneously in history — contributing to a sense of a rich and active period.

For example:

While Darwin was developing his theory of natural selection in England, Alfred Russel Wallace was independently arriving at the same conclusion in Southeast Asia. As scientists were beginning to understand the structure of DNA, engineers were developing the first generation of electronic computers — two revolutions unfolding simultaneously.

11. Describing ongoing past research and investigation

The past continuous is used to describe research, investigation, or study that was ongoing at a particular point in the past — emphasising the active, in-progress nature of the work.

For example:

At the time of the discovery, the team was conducting a routine survey of the ocean floor and was not expecting to find anything unusual. In the early 1980s, scientists were beginning to gather evidence that human activity was affecting the global climate in ways that had not previously been considered possible.

12. Creating dramatic effect in narrative

The past continuous is used in dramatic narrative to slow down the pace of a story — stretching a moment in time and creating suspense before a key event is revealed.

For example:

The submersible was descending slowly into the darkness. The cameras were scanning the featureless ocean floor. And then — without warning — the lights revealed something that would change the course of marine biology forever. Darwin was sitting at his desk in Down House, reading through his notes for the thousandth time, when the letter from Alfred Russel Wallace arrived and changed everything.

C. Past Continuous vs. Simple Past — Key Contrasts

The distinction between the past continuous and the simple past is one of the most important contrasts in the English tense system. The table below summarises the key differences.

For example:

The team was collecting samples when the alarm sounded. (past continuous — background; simple past — main event) The team collected samples and returned to the surface. (both simple past — two completed sequential actions)

D. Stative Verbs and the Past Continuous

As with the present continuous, stative verbs do not normally take the past continuous form. The same categories apply — cognition, emotion, perception, possession, and being.

For example:

At the time of the discovery, scientists knew very little about deep-sea ecosystems. (not were knowing) The glacier contained a remarkable record of past climate extending back 800,000 years. (not was containing)

The same exceptions apply — some stative verbs can be used in the past continuous when they take on a dynamic meaning, changing their sense significantly.

For example:

Darwin was thinking about the implications of his observations as the Beagle sailed northward from the Galápagos. (dynamic — mental process in progress) The team was having difficulty with the calibration of the equipment throughout the first week of the survey. (dynamic — experiencing difficulty)

E. Signal Words and Phrases

For example:

At the time of the discovery, the research team was conducting a routine survey of the Pacific ocean floor. While the surface team was monitoring the data, the submersible was exploring the hydrothermal vent field below.

3. Usage in Context

• The past continuous describes an action that was in progress at a specific, identifiable moment in the past — the action had begun before that moment and had not yet finished at that moment.

At the moment of the discovery, the research team was descending to the ocean floor in the submersible at a rate of fifty metres per minute. In 1912, when Wegener first published his theory of continental drift, most geologists were working within a framework that assumed the continents had always been in their current positions.

• The past continuous describes a background action that was in progress when a shorter, completed event — expressed in the simple past — interrupted it.

The team was collecting samples from the vent field when the submersible’s cameras suddenly revealed a previously unknown species of deep-sea coral. Darwin was reading through his notes when the letter from Alfred Russel Wallace arrived, forcing him to act immediately to establish priority for his theory.

• When introduces the completed interrupting event in the simple past; while and as introduce the ongoing background action in the past continuous.

The geologist was examining the rock formation when she noticed an unusual pattern that suggested ancient volcanic activity. While the surface team was monitoring the instruments, the submersible was making its deepest dive of the entire expedition.

• The past continuous describes two or more actions happening simultaneously in the past.

While Darwin was developing his theory of natural selection in England, Wallace was independently arriving at the same conclusions in the rainforests of Southeast Asia. As the glacier was retreating northward, the rock surfaces it exposed were being colonised by mosses, lichens, and other pioneering species.

• The past continuous sets the scene in narrative — describing what was happening when the story begins, creating a sense of ongoing activity into which the main events will be introduced.

It was January 1977. A research vessel was moving slowly across the surface of the Pacific Ocean, its sonar probing the volcanic ridges of the deep ocean floor below. The year was 1953. In a laboratory in Cambridge, two young scientists were working with X-ray diffraction images and building models from wire and metal, trying to unlock the structure of DNA.

• The past continuous describes gradually developing situations and trends that were underway at a particular point in the past.

By the late 20th century, global temperatures were already rising at a rate that alarmed the scientists who were monitoring them most closely. At the time of Wegener’s death in 1930, the scientific establishment was slowly and reluctantly beginning to acknowledge that his ideas might have some merit after all.

• The past continuous with always, constantly, and continually expresses repeated past actions that the speaker found annoying, frustrating, or remarkable.

The monitoring equipment was constantly breaking down during the most critical phases of the survey, causing significant delays to the data collection programme. The committee was always demanding additional evidence without providing the resources or the time needed to gather it properly.

• The past continuous with wonder and hope makes past requests and enquiries more polite, tentative, and indirect.

I was wondering whether the committee had yet reached a decision on the allocation of funding for the second phase of the research project. We were hoping that the expedition might be extended by an additional two weeks to allow the team to complete the survey of the southern sector.

• The past continuous in academic writing describes the state of knowledge, the prevailing assumptions, or the ongoing work in a field at the time of a discovery or development.

When Watson and Crick published their landmark paper on the structure of DNA, researchers around the world were struggling to understand how genetic information could be both stable and replicable. At the time of the first systematic deep-sea surveys, scientists were generally expecting to find very little life below 1,000 metres — the discovery of thriving vent communities was entirely unexpected.

• The past continuous implies that an action was in progress but was not completed — because it was interrupted or because circumstances changed.

The team was preparing to deploy the second submersible when the weather deteriorated rapidly beyond safe operating limits. Scientists were developing a highly promising new approach to carbon capture when the research programme lost its funding and had to be abandoned.

• The past continuous creates dramatic effect in narrative — slowing the pace, stretching a moment in time, and building suspense before a key event is introduced.

The submersible was descending slowly. The cameras were scanning the featureless sediment of the ocean floor. The instruments were recording nothing unusual. And then — the lights revealed something extraordinary. Darwin was sitting quietly at his desk in the autumn of 1858, surrounded by twenty years of notes and observations, when the letter arrived that would change the course of scientific history.

• The past continuous passive is formed with was/were being + past participle — used to describe an ongoing past action where the focus is on the process rather than the agent.

At the time of the discovery, the data was being analysed by three separate teams working independently at different institutions. The new monitoring network was being constructed across twelve sites when the funding was unexpectedly cut.

• Do not use the past continuous with stative verbs — use the simple past instead.

At the time of the discovery, scientists knew very little about the chemistry of hydrothermal vent fluids. (not were knowing) The glacier contained a climate record extending back more than 800,000 years. (not was containing)

• The past continuous is not used for completed sequential actions — use the simple past for each action in a sequence.

The team descended to the ocean floor, collected the samples, and returned to the surface within twelve hours. (three completed sequential actions — all simple past) The team was descending to the ocean floor when the equipment failed. (ongoing background action interrupted by a completed event)

4. Common Errors and Corrections

5. Lesson Mastery

After completing this lesson, you should now be able to:

    ✅ Form the past continuous tense correctly in affirmative, negative, and question forms

    ✅ Identify and apply the main uses of the past continuous tense

    ✅ Understand the interaction between the past continuous and the simple past in narrative

    ✅ Recognise and correct common errors in the use of the past continuous tense