1. While Tom (read) _________________ , Amely (watch) _________________ a documentary on TV. 2. Marvin (come) _________________ home, (switch) _________________ on the computer and (check) _________________ his emails. 3. The thief (sneak) _________________ into the house, (steal) _________________ the jewels and (leave) _________________ without a trace. 4. Nobody (listen) _________________ while the teacher (explain) _________________ the tenses. 5. While we (do) _________________ a sight-seeing tour, our friends (lie) _________________ on the beach. 6. He (wake) _________________ up and (look) _________________ at his watch.

`Đáp` `án:`

1. was reading / was watching 

2. came / switched / checked

3. sneaked / stole / left 

4. was listening / was explaining

5. were doing / were lying

6. woke / looked 

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Công thức thì QKTD 

(+) S + was/were + Ving 

(-) S + was/were+ not + Ving 

(?) Was/Were +S +Ving? 

→ Diễn tả hành động đang xảy ra ở 1 thời điểm nào đó trong quá khứ 

→ Diễn tả hành động đang xảy ra thì có hành động khác chen vào (while / when)

→ Diễn tả hành động xảy ra song song / cùng lúc 

DHNB: at + giờ + thời gian trong QK, at this time + thời gian trong QK, ...

Công thức thì QKĐ (V: to be)

(+) S + was/were + ... 

(-) S + was/were + not ... 

(?) Was/Were + S ... ? 

S số ít, I, he, she, it + was

S số nhiều, you, we ,they + were

Công thức thì QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...