happening at the same time in the past
an action in progress interrupted by another one
background of a story
action in progress at a specific time
annoying situacion that lasted too long
100

While I was reading, ..............(my sister/draw)

My sister was drawing

100
I was bushing my teeth when ..................(lights/ go out)

the lights went out

100

As the wind was blowing hard,......................(trees/shake)

the trees were shaking.

100

At 10 p.m we ...............(still/work) on my project.

were still working

100

He .........................(always/ lose) his keys! That I ended up hiding a copy under a rock next to the door.

was always losing

200

As we were walking to school, ...........(snow)

it was snowing

200

When .................(her shoe/brake), she was dancing.

her shoe broke

200

While.........................(children/sleep), the storm was starting and thunders were rumbling.

the children were sleeping

200

Yesterday at noon, ..........................(we/have) lunch

we were having lunch

200

She ......................(constantly/ interrupt) me during meetings.

was constantly interrupting 

300

While .....................(kids/play) outside, the parents were talking

the kids were playing

300

We were eating lunch..........................(fire alarm/ring)

when/as the fire alarm rang

300

The birds were singing .................(the sun/rise)

while/as/when the sun was rising

300
At that moment, she ..............(speak) on the phone.
was speaking
300

They ended up getting divorced because they .......................(always/argue) about silly things.

were always arguing

400

As .....................(she/cook) dinner, he..............(set) the table.

She was cooking/ he was setting the table

400

He ....................(write) a message ............................(his phone/die)

was writing / when/as his phone died

400

As he ...........................(walk) through the forest, he heard a a strange noise.

was walking

400

At midnight, ...................(they/drive) home.

they were driving

400

My teacher used to be mad at me almost all the time, I ......................(always/forget) my homework back then.

was always forgetting

500

..................................(they/study), I ...........(listen) to music.

While they were studying / I was listening

500

..........................(the power/go off), they.....................(watch/tv)

When/as the power went off/

they were watchin tv.

500

..........................(party/go on), someone......................(sneak) into the house

While/as the party was going on / was sneaking into the house.

500

At 7 a.m, the birds ......................(already/sing)

were already singing

500

My dog used to be sweet and calm but during his last days he.....................(constantly/bark) at the neighbors due to his bad temper.

was constantly barking

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