Đáp án + Giải thích các bước giải:

`1)` arrived `-` was still sleeping

`2)` went `-` were having

`3)` was having `-` stopped

`4)` came `-` has working

`5)` were crossing `-` saw

`6)` saw `-` was standing

`7)` were playing `-` came

`8)` Rang `-` was talking

`9)` was sitting `-` saw

`10)` was cleaning `-` came

`@` Cấu trúc QKTD:

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

`( - )` S + was/were + not + V-ing

`( ? )` Was/were + S + V-ing

`-` Có when 

`@` Hđộng đang xảy ra: QKTD

`@` Hđộng chen vào: QKĐ

`to` Cả `2` hành động diễn ra song song với nhau trong QK `to` dùng QKTD

`-` Có while:

`to` Cả `2` dùng QKTD

`#Ph`

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)

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

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, ...

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1. arrived / was still sleeping 

2. went / were having 

3. was having / stopped 

4. came / was working 

5. were crossing / saw

6. saw / was standing 

7. were playing / came 

8. rang / was taking 

9. was sitting / saw 

10. were cleaning / came 

`color{orange}{~MiaMB~}`