$#Lúa$

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`1.` While Tom was reading, Amely was watching a documentary on TV.

`2.` Marvin came home, switched on the computer, and checked his emails.

`3.` The thief sneaked into the house, stole the jewels, and left without a trace.

`4.` Nobody was listening while the teacher was explaining the tenses.

`5.` While we were doing a sight-seeing tour, our friends were lying on the beach.

`6.` He woke up and looked at his watch.

`7.` The receptionist welcomed the guests and asked them to fill in the form.

`8.` The car broke down and we had to walk home.

`9.` The boys were swimming while the girls were sunbathing.

`10.` My father came in, looked around, and told me to tidy up my room

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`@` Qúa Khứ Đơn:

`_` Dạng tobe:

`+)` S + was/ were +…

`-)` S + was/ were + not

`?)` Was/ Were + S +…?

`_`  Yes, S + was/ were.

`_` No, S + was/ were + not

`_` Dạng V (thường)

`+)` S + V2/ed + .....

`-)` S + did not + V (nguyên thể) + ....

`?)` Did + S + V(nguyên thể) +…

`_` Yes, S + did.

`_` No, S + didn't.

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`@` Quá khứ tiếp diễn:

`+)` S + was/were + V-ing

`-)` S + was/were + not + V-ing

`?` Was/Were + S + V-ing ?