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

* Các câu này đều theo một cách dùng của thì quá khứ tiếp diễn và quá khứ đơn

+) Hành động đang diễn ra trong quá khứ: quá khứ tiếp diễn

- Cấu trúc: S + was/were + Ving

+) Hành động xen vào: quá khứ đơn. Cấu trúc: S + V2/ed

$\text{1.}$ Arrived / was still sleeping

Quá khứ đơn / quá khứ tiếp diễn

$\text{2.}$ Went / were having

Quá khứ đơn

$\text{3.}$ Was having / stopped

$\text{4.}$ Came / was working

$\text{5.}$ Were crossing / saw

Quá khứ tiếp diễn / quá khứ đơn

$\text{6.}$ Saw / was standing

$\text{7.}$ Were playing / came

$\text{8.}$ Rang / was taking

$\text{9.}$ Was sitting / saw

$\text{10.}$ Were cleaning / came

$\text{Giải thích chung :}$

$\text{+)}$ Quá khứ tiếp diễn diễn tả hành động đang xảy ra trong quá khứ

S + was / were + V - ing

$\text{+)}$ Quá khứ đơn diễn tả hành động khác xen vào khi hành động đang xảy ra :

S + V2 / V- ed

$\text{#Xuka2k10}$