Past Simple
vs Continuous

While one action was going on, something else happened. The action in progress takes was / were + -ing, the event that cuts in takes the past simple. Which is which?

B18 mistakes46 questions5 levels

ExplanationAn event or an action in progress? when + event, while + action in progress Common Mistakes8 mistakes and who tends to make them Exercises46 questions, 5 levels

For teachers

Act the scene out. One student silently does something (reading), a second student suddenly walks in. The class says: He was reading when she came in. Movement separates the action in progress from the event that cuts in.
A long line and a short dot on the board. Draw the action in progress as a long line and the event that cuts in as a dot on top of it. Line → was / were + -ing, dot → past simple. This completes the timeline you started in topic 7.
Ask the three questions. For every sentence: a single finished event? an action in progress? both together? Make students explain their choice.
A story-starter game. The teacher sets the scene: “It was a dark night and the wind was blowing…” Students take turns adding an event that cuts in: “…when I heard a noise.”
Don't teach when and while as rules. Show that both can point either way (When she came in, I was reading / I stood up). The real rule is the question “which is in progress and which is the event?”
Do the “Type it” level with books closed. Some answers have two correct forms; discussing them shows that tenses don't always have a single right answer.

Topic order

What it's for

The basic difference: an event or an action in progress? The past simple tells a finished event (The phone rang.). The past continuous tells an action that was going on (I was cooking.). Put them together and you get a very common pattern: I was cooking when the phone rang. Say the action in progress first (the long background action), then the event that cut in (the short one).

Decide with three questions. (1) Is the action one of several events in order, or a single finished action? → past simple. (2) Is it an action in progress at a given moment, with no start or end mentioned? → past continuous. (3) Are both in one sentence? The one in progress takes was / were + -ing and the one that cuts in takes the past simple.

When and while. While usually sits next to the action in progress: While I was walking, I saw an accident. When usually sits next to the event: I was walking when I saw an accident. If two actions go on at the same time, both are past continuous: While I was cooking, he was setting the table.

The order can change the meaning. When I got home, my mum was cooking. = she had already started and was still cooking. When I got home, my mum cooked dinner. = she started cooking after I arrived. Both are correct; they mean different things. Think about which one you want to say.

It isn't always the past continuous. Events in order (I opened the door and went in), a single finished action (Yesterday I went to the dentist), past habits (When I was a child, I played football every day) and stative verbs (I knew the answer) take the past simple. Verbs of perception are usually past simple too: I heard a noise, I saw a light.

Most languages mark the difference between “was doing” and “did”. Spanish caminaba / vi, French je marchais / j'ai vu, Italian camminavo / vidi and Turkish yürüyordum / gördüm all do it. Learners from those languages find the idea easy; the problems are the exact English forms and the habit use, which English puts in the past simple.

The patterns side by side

Action in progress + event	was / were + -ing + when + V2	I was cooking when the phone rang.
while + action in progress	While + was / were + -ing, V2	While I was walking, I saw an accident.
Two actions at once	was / were + -ing … was / were + -ing	While I was cooking, he was setting the table.
Events in order	V2 … V2	I opened the door and went in.
Negative	wasn't / weren't + -ing · didn't + V1	I wasn't listening, so I didn't hear it.
Question	What were you doing when…? · What did you do…?	What were you doing when I called?

Signals: which tense?

whilePast continuous — the action in progressWhile I was walking, I saw an accident.

at 8 o'clock yesterday, at that timePast continuous — in progress at a given momentAt 8 o'clock I was having breakfast.

when + short eventPast simple — the eventI was walking when I saw an accident.

suddenly, then, after thatPast simple — the eventSuddenly the lights went out.

first … then …Past simple — events in orderFirst I opened the door, then I went in.

yesterday, last week, two days ago (a single action)Past simple — finished timeI went to the dentist yesterday.

every day / every summer (a past habit)Past simple — repeatedWe went to the beach every summer.

know, like, want, hear, seePast simple — stative and perception verbsI heard a noise.

When can point either way: When she came in, I was reading (I was already reading) and When she came in, I stood up (one after the other). So when alone doesn't decide; ask which action was in progress and which one was the event.

Common mistakes

and who tends to make them

These eight mistakes turn up in classrooms everywhere. Three sources explain most of them: putting the two tenses the wrong way round, treating a short event as an action in progress, and putting the past continuous on every verb. Under each one you'll see who tends to make it.

Most common worldwideWhen the phone was ringing, I watched TV.When the phone rang, I was watching TV.

Why: The tenses are the wrong way round. The action in progress (watching TV) is was watching, the short event that cuts in (the phone ringing) is rang. Ask which one is long and which one is short.

Who makes it: Learners at every level who put the tense of the first-mentioned clause on the wrong action.

I was seeing a strange light in the sky.I saw a strange light in the sky.

Why: Verbs of perception such as see, hear, notice happen in an instant and are usually past simple: I saw, I heard. Using -ing with them sounds wrong.

Who makes it: Learners who learned the continuous as “the tense for descriptions” and use it with every verb.

Changes the meaningWhen I got home, my mum cooked dinner. (she was already cooking)When I got home, my mum was cooking dinner.

Why: Both sentences are correct but they mean different things. Cooked = she started cooking after I arrived (one after the other). Was cooking = she had already started and was in the middle of it. Choose the order you mean.

Who makes it: Learners whose first language doesn't mark the order with tense, and who rely on when alone.

Events in orderI was cooking dinner and then I was burning my hand.I was cooking dinner when I burned my hand.

Why: The burn happened in a moment: the event is past simple. The past continuous is only for the background action in progress (cooking). If both were events in a row, both would be past simple.

Who makes it: Learners who think the continuous sounds “more descriptive” and use it for a story's events.

Stative verbsI was wanting a coffee when I walked in.I wanted a coffee when I walked in.

Why: Want, know, like, love, need, believe describe a state, not an activity, so they take the past simple. The past continuous isn't used with them.

Who makes it: Speakers of languages where states can also take a progressive form, and learners who think -ing always sounds more natural.

She was cooked dinner when I arrived.She was cooking dinner when I arrived.

Why: After was / were the verb takes -ing, not the second form. Was cooked is a passive (“had been cooked”), not an action in progress.

Who makes it: Beginners who have just learned -ing and attach it to the verb without was / were + the right form.

A single actionYesterday I was going to the cinema.Yesterday I went to the cinema.

Why: A single finished action with a finished time such as yesterday is past simple. The past continuous stresses an action in progress, not a single completed one.

Who makes it: Learners who think the continuous is “more advanced” and put it on single finished actions.

Past habitsWhen I was a child, I was playing football every day.When I was a child, I played football every day.

Why: A repeated habit in the past is expressed with the past simple (or used to). The Turkish -ıyordum misleads here: in English was playing means “was in the middle of playing”.

Who makes it: Speakers of languages with an imperfect tense (Spanish, French, Italian, Turkish) that covers both habits and actions in progress.

Exercises

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I ___ TV when the phone suddenly rang. (was watching / watch / will watch)

The phone suddenly ___ while I was cooking. (rang / was ringing / rings)

She ___ in the garden at 5 o'clock yesterday. (was working / works / will work)

First he opened the door, then he ___ in. (went / was going / goes)

While Mum was cooking, Dad ___ the table. (was setting / sets / will set)

It was raining, so we ___ at home. (stayed / stay / will stay)

What ___ you doing at eight o'clock? (were / did / was)

He ___ his keys yesterday. (lost / was losing / loses)

I was walking home when I ___ an old friend. (met / was meeting / meet)

They were playing football when the lights suddenly ___ . (went out / were going out / go out)

She ___ a shower when the doorbell rang. (was taking / takes / will take)

While we ___ dinner, the lights went out. (were having / have / are having)

At 11 p.m. we ___ TV. We were already in bed. (weren't watching / wasn't watching / not watching)

He ___ the bus and went home. (took / was taking / takes)

Why ___ you running when I saw you? (were / did / was)

The teacher came in while we ___ loudly. (were talking / was talking / talk)

I was walking home when I suddenly ___ a strange noise. (heard / was hearing / hear)

She ___ her leg while she was skiing. (broke / was breaking / breaks)

Yesterday I ___ to the dentist at 10 and came home at 11. (went / was going / go)

While he was driving, a deer suddenly ___ across the road. (ran / was running / runs)

I ___ the accident because I was looking at my phone. (didn't see / wasn't seeing / didn't saw)

When I was a child, I ___ the guitar every day. (practised / was practising / practise)

At this time yesterday we ___ in traffic. (were sitting / was sitting / sit)

While Tom ___ the dishes, he dropped a glass. (was washing / washes / will wash)

They were playing the match when it suddenly ___ to rain. (began / was beginning / begins)

She was reading when she ___ a loud scream. (heard / was hearing / hears)

The film was on from 8:00 to 10:00. At 9:00 the lights went out. When the lights went out, we ___ the film. (were watching / watched / had watched)

Anna came in at 7:00. Dinner was ready at 7:30. When Anna came in, her mother ___ dinner. (was cooking / cooked / had cooked)

I opened the door, switched on the light and ___ in. (walked / was walking / walks)

Mark was at the bus stop from 8:00 to 8:20. At 8:10 he saw an old friend. At 8:10 Mark ___ for the bus. (was waiting / waited / is waiting)

I ___ the bus at 7:30 and arrived at 8:00. (took / was taking / take)

While she was crossing the road, a car ___ her. (hit / was hitting / hits)

At 11 p.m. I was fast asleep, so I ___ the noise outside. (didn't hear / wasn't hearing / didn't heard)

Ben ___ his homework when his friend called, so he talked for a while and then finished it. (was doing / does / will do)

She ___ at the café every Saturday last year. (worked / was working / works)

Suddenly the phone ___ , and everyone jumped. (rang / was ringing / rings)

I started watching TV at 8:00 and stopped at 10:00. When the phone rang at 9:00, I ___ TV. (watch)

She ___ her leg while she was skiing. (break)

While we ___ lunch, it started to rain. (have)

What ___ at 9 o'clock last night? (you / do)

I ___ the accident because I was looking at my phone. (not / see)

Suddenly the lights ___ . (go out)

He ___ on the phone when I came in. (talk)

When I was a child, we ___ to the beach every summer. (go)

I ___ a shower when you called, so I didn't answer. (take)

First I opened the door, then I ___ in. (walk)

Past Simple vs Continuous