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Cộng tác viên

Khẳng định

S + was / were + V-ing

Phủ định

S + was / were + not + V-ing

Nghi vấn

Was / Were + S + V-ing?

Cách dùng
Hành động đang xảy ra tại một thời điểm trong quá khứ
Hai hành động đang xảy ra song song trong quá khứ

Ví dụ
I was doing homework at 7 p.m.
She was cooking when I came.
They were playing football.
We were not sleeping.
Were you watching TV?

Mẹo nhớ nhanh
Hiện tại: am / is / are + V-ing
Quá khứ: was / were + V-ing