$\text{@su}$

`13,` were crossing / shouted

`=>` As + S + was/were + V-ing, S2 + V-ed : Trong khi S1 đang làm gì thì S2 làm gì

`14,` was walking / was seeing

`=>`Cấu trúc : While + thì QKTD, thì QKTD

`15,` went out / was shining

`=>` Cấu trúc : When + S1 + V-ed, S2 + was V-ing : Khi S1 làm gì thì S2 đang làm gì

`16,` had gone / sat / rested

`=>` Cấu trúc : After + S + had P2, S + V-ed

`17,` came / had finished

`=>` Cấu trúc before : Before + S + V-ed, S + had P2

`18,` rang / was having

`=>` Cấu trúc : When + S1 + V-ed, S2 + was V-ing

`19,` was singing / came

`=>` Cấu trúc : When + S1 + V-ed, S2 + was V-ing / nhưng vế "when" lại ở giữa

`20,` went / stopped

`=>` Cấu trúc : S1 + V(quá khứ đơn) + as soon as + S2 + V(QKĐ/QKHT)

$\text{@Bulletproof Boy Scout}$

đây ah