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

2). Marvin  came home,  switched on the computer and (check) his emails.

3). The thief  sneaked into the house, stole the jewels and  without a trace 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 lied 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. 

            <no coppy > xin ctrhn :)))))))))))

1. was reading - was watching

Thì QkTD diễn tả 2 hành động xảy ra song song trong quá khứ

2. came - switched - checked

liệt kê một loạt hành động trong quá khứ thì dùng QKĐ

3. sneaked - stole - left

4. was listening - was explaining

5. were doing - were lying

6. woke - looked

7. welcomed - asked

8. broke - had

9. were swimming - were sunbathing

10. came - looked - told